/*
Form tag functions
*/

function addClass(element, className) {
    if (!hasClass(element, className)) {
        if (element.className) element.className += " " + className;
        else element.className = className;
    }
};

function removeClass(element, className) {
    var regexp = new RegExp("(^|\\s)" + className + "(\\s|$)");
    element.className = element.className.replace(regexp, "$2");
};

function hasClass(element, className) {
    var regexp = new RegExp("(^|\\s)" + className + "(\\s|$)");
    return regexp.test(element.className);
};

/*
Script Name: Javascript Cookie Script
Author: Public Domain, with some modifications
Script Source URI: http://techpatterns.com/downloads/javascript_cookies.php
Version 1.0.0
Last Update: 30 May 2004

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
*/

// this function gets the cookie, if it exists
function getCookie( name ) {
	
	var start = document.cookie.indexOf( name + "=" );
	var len = start + name.length + 1;
	if ( ( !start ) && ( name != document.cookie.substring( 0, name.length ) ) )
	{
		return null;
	}
	if ( start == -1 ) return null;
	var end = document.cookie.indexOf( ";", len );
	if ( end == -1 ) end = document.cookie.length;
	return unescape( document.cookie.substring( len, end ) );
}

/*
only the first 2 parameters are required, the cookie name, the cookie
value. Cookie time is in milliseconds, so the below expires will make the 
number you pass in the Set_Cookie function call the number of days the cookie
lasts, if you want it to be hours or minutes, just get rid of 24 and 60.

Generally you don't need to worry about domain, path or secure for most applications
so unless you need that, leave those parameters blank in the function call.
*/
function setCookie( name, value, expires, path, domain, secure ) {
	// set time, it's in milliseconds
	var today = new Date();
	today.setTime( today.getTime() );
	// if the expires variable is set, make the correct expires time, the
	// current script below will set it for x number of days, to make it
	// for hours, delete * 24, for minutes, delete * 60 * 24
	if ( expires )
	{
		expires = expires * 1000 * 60 * 60 * 24;
	}
	//alert( 'today ' + today.toGMTString() );// this is for testing purpose only
	var expires_date = new Date( today.getTime() + (expires) );
	//alert('expires ' + expires_date.toGMTString());// this is for testing purposes only

	document.cookie = name + "=" +escape( value ) +
		( ( expires ) ? ";expires=" + expires_date.toGMTString() : "" ) + //expires.toGMTString()
		( ( path ) ? ";path=" + path : "" ) + 
		( ( domain ) ? ";domain=" + domain : "" ) +
		( ( secure ) ? ";secure" : "" );
}

// this deletes the cookie when called
function deleteCookie( name, path, domain ) {
	if ( getCookie( name ) ) document.cookie = name + "=" +
			( ( path ) ? ";path=" + path : "") +
			( ( domain ) ? ";domain=" + domain : "" ) +
			";expires=Thu, 01-Jan-1970 00:00:01 GMT";
}


/* 
 * Kills an event's propagation and default action
 */
function knackerEvent(eventObject) {
    if (eventObject && eventObject.stopPropagation) {
        eventObject.stopPropagation();
    }
    if (window.event && window.event.cancelBubble ) {
        window.event.cancelBubble = true;
    }
    
    if (eventObject && eventObject.preventDefault) {
        eventObject.preventDefault();
    }
    if (window.event) {
        window.event.returnValue = false;
    }
}

function Obj_findStyleValue(target, styleProp, IEStyleProp) {
	if (target.currentStyle) return target.currentStyle[ IEStyleProp ] ;
	else if (window.getComputedStyle) {
		compStyle = window.getComputedStyle(target,'') ;
		return compStyle.getPropertyValue(styleProp) ;
	}
}

/*	dynamicCSS.js v1.0 <http://www.bobbyvandersluis.com/articles/dynamicCSS.php>
	Copyright 2005 Bobby van der Sluis
	This software is licensed under the CC-GNU LGPL <http://creativecommons.org/licenses/LGPL/2.1/>
*/

function createStyleRule(selector, declaration) {
	if (!document.getElementsByTagName || !(document.createElement || document.createElementNS)) return;
	var agt = navigator.userAgent.toLowerCase();
	var is_ie = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
	var is_iewin = (is_ie && (agt.indexOf("win") != -1));
	var is_iemac = (is_ie && (agt.indexOf("mac") != -1));
	if (is_iemac) return; // script doesn't work properly in IE/Mac
	var head = document.getElementsByTagName("head")[0]; 
	var style = (typeof document.createElementNS != "undefined") ?  document.createElementNS("http://www.w3.org/1999/xhtml", "style") : document.createElement("style");
	if (!is_iewin) {
		var styleRule = document.createTextNode(selector + " {" + declaration + "}");
		style.appendChild(styleRule); // bugs in IE/Win
	}
	style.setAttribute("type", "text/css");
	style.setAttribute("media", "screen"); 
	head.appendChild(style);
	if (is_iewin && document.styleSheets && document.styleSheets.length > 0) {
		var lastStyle = document.styleSheets[document.styleSheets.length - 1];
		if (typeof lastStyle.addRule == "object") { // bugs in IE/Mac and Safari
			lastStyle.addRule(selector, declaration);
		}
	}
}

function setElementStyleByClass(cl, propertyName, propertyValue) {
	if (!document.getElementsByTagName) return;
	var re = new RegExp("(^| )" + cl + "( |$)");
	var el = document.all ? document.all : document.getElementsByTagName("body")[0].getElementsByTagName("*"); // fix for IE5.x
	for (var i = 0; i < el.length; i++) {
		if (el[i].className && el[i].className.match(re)) {
			el[i].style[propertyName] = propertyValue;
		}
	}
}

function setElementStyleById(id, propertyName, propertyValue) {
	if (!document.getElementById) return;
	var el = document.getElementById(id);
	if (el) el.style[propertyName] = propertyValue;
}


/***********************************************
* AnyLink Drop Down Menu- � Dynamic Drive (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit http://www.dynamicdrive.com/ for full source code
* http://www.dynamicdrive.com/dynamicindex1/dropmenuindex.htm
***********************************************/

function showMenu(e, menu, menudiv) {
    knackerEvent(e);
    var obj = document.getElementById(menu);
    if (!obj) return;
    changeMenus(menu);
    //var menuwidth = (obj.offsetWidth - 10) + 'px';
    var menuwidth = 190 + 'px';
    dropdownmenu(obj, e, menuwidth, menudiv);
}

function getposOffset(what, offsettype) {
    var totaloffset = (offsettype=="left")? what.offsetLeft : what.offsetTop;
    var parentEl = what.offsetParent;
    while(parentEl!=null) {
        totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;
        parentEl=parentEl.offsetParent;
    }
    return totaloffset;
}


function showhide(obj, e, visible, hidden, menuwidth) {
    if(ie4||ns6)
        dropmenuobj.style.left = dropmenuobj.style.top="-500px";
    if(menuwidth != "") {
        dropmenuobj.widthobj = dropmenuobj.style;
        dropmenuobj.widthobj.width = menuwidth;
    }
    if(e.type == "click" && obj.display == 'none' || e.type == "mouseover")
        obj.display = visible;
    else if(e.type == "click")
        obj.display = hidden;
}

function iecompattest() {
    return (document.compatMode && document.compatMode != "BackCompat")? document.documentElement : document.body;
}

function clearbrowseredge(obj, whichedge){
    var edgeoffset=0;
    if (whichedge == "rightedge") {
        var windowedge=ie4 && !window.opera? iecompattest().scrollLeft+iecompattest().clientWidth-15 : window.pageXOffset+window.innerWidth-15;
        dropmenuobj.contentmeasure=dropmenuobj.offsetWidth;
        if (windowedge-dropmenuobj.x < dropmenuobj.contentmeasure)
            edgeoffset=dropmenuobj.contentmeasure-obj.offsetWidth;
    } else {
        var topedge = ie4 && !window.opera? iecompattest().scrollTop : window.pageYOffset;
        var windowedge = ie4 && !window.opera? iecompattest().scrollTop+iecompattest().clientHeight-15 : window.pageYOffset+window.innerHeight-18;
        dropmenuobj.contentmeasure = dropmenuobj.offsetHeight;
        if (windowedge-dropmenuobj.y < dropmenuobj.contentmeasure) { //move up?
            edgeoffset=dropmenuobj.contentmeasure+obj.offsetHeight;
            if ((dropmenuobj.y-topedge)<dropmenuobj.contentmeasure) //up no good either?
                edgeoffset=dropmenuobj.y+obj.offsetHeight-topedge;
        }
    }
    return edgeoffset;
}

function dropdownmenu(obj, e, menuwidth, menudiv){
    if (window.event) event.cancelBubble=true;
    else if (e.stopPropagation) e.stopPropagation();
    dropmenuobj = document.getElementById(menudiv);
    dropmenuobj.menuid = menudiv;

    if (ie4||ns6) {
        showhide(dropmenuobj.style, e, "block", "none", menuwidth);
        dropmenuobj.x = getposOffset(obj, "left");
        dropmenuobj.y = getposOffset(obj, "top");
        dropmenuobj.style.left = dropmenuobj.x-clearbrowseredge(obj, "rightedge") + "px";
        dropmenuobj.style.top = dropmenuobj.y-clearbrowseredge(obj, "bottomedge") + obj.offsetHeight+"px";
    }
    return clickreturnvalue()
}

function clickreturnvalue() {
    if (ie4||ns6) return false;
    else return true;
}

function contains_ns6(a, b) {
    while(b.parentNode)
        if((b = b.parentNode) == a)
            return true;
    return false;
}

function hidemenu() {
    if(typeof dropmenuobj!="undefined") {
        setElementStyleById('hd_menu', 'borderTop', '1px #f6f6f6 solid'); 
        setElementStyleById('hd_menu', 'borderLeft', '1px #f6f6f6 solid'); 
        setElementStyleById('hd_menu', 'borderRight', '1px #f6f6f6 solid');
        setElementStyleById('fd_menu', 'borderTop', '1px #f6f6f6 solid'); 
        setElementStyleById('fd_menu', 'borderLeft', '1px #f6f6f6 solid'); 
        setElementStyleById('fd_menu', 'borderRight', '1px #f6f6f6 solid');
        setElementStyleById('sd_menu', 'borderTop', '1px #f6f6f6 solid'); 
        setElementStyleById('sd_menu', 'borderLeft', '1px #f6f6f6 solid'); 
        setElementStyleById('sd_menu', 'borderRight', '1px #f6f6f6 solid');
        if (ie4||ns6)
            dropmenuobj.style['display'] = "none";
    }
}

function changeMenus(menu) {
    if(typeof dropmenuobj!="undefined") {
        if(menu != 'hd_menu') {
            setElementStyleById('hd_menu', 'borderTop', '1px #f6f6f6 solid'); 
            setElementStyleById('hd_menu', 'borderLeft', '1px #f6f6f6 solid'); 
            setElementStyleById('hd_menu', 'borderRight', '1px #f6f6f6 solid');
        }
        if(menu != 'fd_menu') {
            setElementStyleById('fd_menu', 'borderTop', '1px #f6f6f6 solid'); 
            setElementStyleById('fd_menu', 'borderLeft', '1px #f6f6f6 solid'); 
            setElementStyleById('fd_menu', 'borderRight', '1px #f6f6f6 solid');
        }
        if(menu != 'sd_menu') {
            setElementStyleById('sd_menu', 'borderTop', '1px #f6f6f6 solid'); 
            setElementStyleById('sd_menu', 'borderLeft', '1px #f6f6f6 solid'); 
            setElementStyleById('sd_menu', 'borderRight', '1px #f6f6f6 solid');
        }
        if(window.hd) {
            var div = document.getElementById('hd_dropmenu');
            div.innerHTML = hd;
            tags = '';
            xtags = '';
        } 
        if(window.fd) {
            var div = document.getElementById('fd_dropmenu');
            div.innerHTML = fd;
            tags = '';
            xtags = '';
        } 
        if(window.sd) {
            var div = document.getElementById('sd_dropmenu');
            div.innerHTML = sd;
            tags = '';
            xtags = '';
        }
        if (ie4||ns6)
            dropmenuobj.style['display'] = "none";
    }
}

function selectTag(tnfo) {
    var section_ = tnfo.substring(0,2);
    if(section_ == 'hd') {
        section = 'headlines';
        var div = document.getElementById(section_ + '_dropmenu');
        if(!window.hd) hd = div.innerHTML;
    } else if(section_ == 'fd') {
        section = 'feeds';
        var div = document.getElementById(section_ + '_dropmenu');
        if(!window.fd) fd = div.innerHTML;
    } else if(section_ == 'sd') {
        section = 'saved';
        var div = document.getElementById(section_ + '_dropmenu');
        if(!window.sd) sd = div.innerHTML;
    } else return;
    var act = tnfo.substring(3,6);
    var tag = tnfo.substring(7,tnfo.length);
    
    if(act == 'add') {
        if(tags == '') tags = tag;
        else tags = tags + ',' + tag;
    } else if(act == 'del') {
        if(xtags == '') xtags = tag;
        else xtags = xtags + ',' + tag;
    }
    // Check if this target is already in the process of being submitted. 
    // If so, don't allow it to be submitted again.
    if(div.ajaxInProgress) return;

    // Set up POST back url
    var posturl = 'https://www.scienceweek.cz/' + section;
    if(tags != '') posturl = posturl + '/tags/' + tags; 
    if(xtags != '') posturl = posturl + '/-tags/' + xtags; 

    // Set up the request
    var xmlhttp =  new XMLHttpRequest();
    xmlhttp.open('POST', posturl, true);

    // The callback function
    xmlhttp.onreadystatechange = function() {
        if (xmlhttp.readyState == 4) {
          if (xmlhttp.status == 200) {
            var related = xmlhttp.responseXML.getElementsByTagName('result')[0].firstChild.nodeValue;
            div.style['width'] = 'auto';
            div.innerHTML = related;
            div.ajaxinProgress = false;
            // IE needs this for some reason ?
            div.style['display'] = 'block';
          } 
        }
    }

    // Send the POST request
    xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    xmlhttp.send('act=getrelated&ajax=true');
    div.ajaxinProgress = true;
    var p = document.createElement('p');
    p.innerHTML = 'loading...';
    div.appendChild(p);
}

var page_events = {
	'span.toggleextra' : function(el) {
		el.onclick = function() {
            if (el.id && el.id.substring(0,6)=='title-')
                iid = el.id.substring(6, el.id.length);
            else
                return false;
            var item = document.getElementById('item-'+iid) ;
            var i;
            var re = new RegExp("(^| )titlebar( |$)");
            for (i=0; i<item.childNodes.length; i++) {
                if(item.childNodes[i].id && item.childNodes[i].id.substring(0,6)=='extra-') {
                    extra = item.childNodes[i];
                    break;
                }
                            }
            status = Obj_findStyleValue(extra,'display','display');
            if (status!='block') {
                extra.style['display'] = 'block';
                            } else {
                extra.style['display'] = 'none';
            }
            return false;
		}
	},

   'a.toggledisplay' : function(el) {
        el.onclick = function(e) {
            knackerEvent(e);
            if(el.innerHTML == 'rozbalit vše') {
                setElementStyleByClass('extra', 'display', 'block');
                setCookie('scienceweek-expandall', 'true', 365, '/');
                createStyleRule("#items li.item", "border-bottom: 2px solid #DFDFDF;");
                createStyleRule("#items li.last", "border-bottom: 0px;");
            } else {
                setElementStyleByClass('extra', 'display', 'none');
                deleteCookie('scienceweek-expandall', '/');
                createStyleRule("#items li.item", "border-bottom: 1px solid #DFDFDF;");
                createStyleRule("#items li.last", "border-bottom: 0px;");
            } 
        }
    },

    'a#toggle_feednfo' : function(el) {
        el.onclick = function(e) {
            knackerEvent(e);
            setElementStyleById('feedinfo', 'display', 'block'); 
            setElementStyleById('toggle_feednfo', 'display', 'none'); 
        }
    },

    'a.collapseitem' : function(el) {
        el.onclick = function(e) {
            knackerEvent(e);
            if (el.id && el.id.substring(0,9)=='collapse-')
                iid = el.id.substring(9, el.id.length);
            else
                return false;
            var extra = document.getElementById('extra-'+iid) ;
            extra.style['display'] = 'none';
        }
    },

    'li#hd_menu' : function(el) {
        el.onmouseover = function(e) {
            setElementStyleById('hd_menu', 'borderTop', '1px #C3C3C3 solid'); 
            setElementStyleById('hd_menu', 'borderLeft', '1px #C3C3C3 solid'); 
            setElementStyleById('hd_menu', 'borderRight', '1px #C3C3C3 solid'); 
        }
        el.onmouseout = function(e) {
            var m = document.getElementById('hd_dropmenu');
            status = Obj_findStyleValue(m,'display','display');
            if(status != 'block') {
                setElementStyleById('hd_menu', 'borderTop', '1px #f6f6f6 solid'); 
                setElementStyleById('hd_menu', 'borderLeft', '1px #f6f6f6 solid'); 
                setElementStyleById('hd_menu', 'borderRight', '1px #f6f6f6 solid');
            }
        }
    },

    'li#fd_menu' : function(el) {
        el.onmouseover = function(e) {
            setElementStyleById('fd_menu', 'borderTop', '1px #C3C3C3 solid'); 
            setElementStyleById('fd_menu', 'borderLeft', '1px #C3C3C3 solid'); 
            setElementStyleById('fd_menu', 'borderRight', '1px #C3C3C3 solid'); 
        }
        el.onmouseout = function(e) {
            var m = document.getElementById('fd_dropmenu');
            status = Obj_findStyleValue(m,'display','display');
            if(status != 'block') {
                setElementStyleById('fd_menu', 'borderTop', '1px #f6f6f6 solid'); 
                setElementStyleById('fd_menu', 'borderLeft', '1px #f6f6f6 solid'); 
                setElementStyleById('fd_menu', 'borderRight', '1px #f6f6f6 solid');
            }
        }
    },

    'li#sd_menu' : function(el) {
        el.onmouseover = function(e) {
            setElementStyleById('sd_menu', 'borderTop', '1px #C3C3C3 solid'); 
            setElementStyleById('sd_menu', 'borderLeft', '1px #C3C3C3 solid'); 
            setElementStyleById('sd_menu', 'borderRight', '1px #C3C3C3 solid'); 
        }
        el.onmouseout = function(e) {
            var m = document.getElementById('sd_dropmenu');
            status = Obj_findStyleValue(m,'display','display');
            if(status != 'block') {
                setElementStyleById('sd_menu', 'borderTop', '1px #f6f6f6 solid'); 
                setElementStyleById('sd_menu', 'borderLeft', '1px #f6f6f6 solid'); 
                setElementStyleById('sd_menu', 'borderRight', '1px #f6f6f6 solid');
            }
        }
    },

    'a#hd_menu2' : function(el) {
        el.onclick = function(e) {
            if(!e) e = window.event;
            var m = document.getElementById('hd_dropmenu');
            status = Obj_findStyleValue(m,'display','display');
            if(status != 'block')
                showMenu(e, 'hd_menu', 'hd_dropmenu');
            else {
                knackerEvent(e);
                setElementStyleById('hd_dropmenu', 'display', 'none');
            }
        } 
    },

    'a#sd_menu2' : function(el) {
        el.onclick = function(e) {
            if(!e) e = window.event;
            var m = document.getElementById('sd_dropmenu');
            status = Obj_findStyleValue(m,'display','display');
            if(status != 'block')
                showMenu(e, 'sd_menu', 'sd_dropmenu');
            else {
                knackerEvent(e);
                setElementStyleById('sd_dropmenu', 'display', 'none');
            }
        } 
    },

    'a#fd_menu2' : function(el) {
        el.onclick = function(e) {
            if(!e) e = window.event;
            var m = document.getElementById('fd_dropmenu');
            status = Obj_findStyleValue(m,'display','display');
            if(status != 'block')
                showMenu(e, 'fd_menu', 'fd_dropmenu');
            else {
                knackerEvent(e);
                setElementStyleById('fd_dropmenu', 'display', 'none');
            }
        } 
    },

    'div#hd_dropmenu' : function(el) {
        el.onclick = function(e) {
            if(!e) e = window.event;
            if(e.altKey) {
                knackerEvent(e);
                var target = window.event ? window.event.srcElement : e ? e.target : null;
                if (!target) return;
                selectTag(target.id);
            }
        } 
    },

    'div#fd_dropmenu' : function(el) {
        el.onclick = function(e) {
            if(!e) e = window.event;
            if(e.altKey) {
                knackerEvent(e);
                var target = window.event ? window.event.srcElement : e ? e.target : null;
                if (!target) return;
                selectTag(target.id);
            }
        } 
    },

    'div#sd_dropmenu' : function(el) {
        el.onclick = function(e) {
            if(!e) e = window.event;
            if(e.altKey) {
                knackerEvent(e);
                var target = window.event ? window.event.srcElement : e ? e.target : null;
                if (!target) return;
                selectTag(target.id);
            }
        } 
    }
    
};

if (document.getElementById) {
    var ie4 = document.all;
    var ns6 = document.getElementById && !document.all;
    
    var tags = '';
    var xtags = '';

    document.onclick = hidemenu;

            document.write('<link rel="stylesheet" type="text/css" href="https://www.scienceweek.cz/js/dnl_hide.css" />');
    
    Behaviour.register(page_events);
}

// add bookmark / favorites
// example: <a href="#" title="Přidat stránku k oblíbeným odkazům" rel="sidebar" onclick="return AddFavorite(document.location.href,document.title,this);">Oblíbený</a>
function AddFavorite(uri, title, this_a)  {
  if (document.all && !window.opera)  {
    window.external.AddFavorite(uri,title);
    return false;
  }
  else if (window.opera) {
    this_a.title = title;
    return true;
  }
  else if ((typeof window.sidebar == 'object') && (typeof window.sidebar.addPanel == 'function')) {
    if (window.confirm('Přidat oblíbenou stránku jako nový panel?'))  {
      window.sidebar.addPanel(title, uri, '');
      return false;
    }
  }
  window.alert('Po potvrzení stiskněte CTRL-D,\nstránka bude přidána k vašim oblíbeným odkazům.');
  return false;
}