//Drop Down Tab Menu- Author: Dynamic Drive (http://www.dynamicdrive.com)
//Created/ updated: October 23rd, 06'

var tabdropdown={
disappeardelay: 350, //set delay in miliseconds before menu disappears onmouseout
disablemenuclick: true, //when user clicks on a menu item with a drop down menu, disable menu item's link?
downsymbol: '', //HTML "symbol" to use to indicate this is a dropdown menu item. Enter ('') to disable.

//No need to edit beyond here////////////////////////
dropmenuobj: null, ie: document.all, firefox: document.getElementById&&!document.all, previousmenuitem:null,

getposOffset:function(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;
},

showhide:function(obj, e, obj2){ //obj refers to drop down menu, obj2 refers to tab menu item mouse is currently over
if (e.type=="click" && obj.visibility==hidden || e.type=="mouseover")
setTimeout(function(){tabdropdown.dropmenuobj.style.visibility='visible';}, this.disappeardelay)
else if (e.type=="click")
obj.visibility="hidden"
},

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

clearbrowseredge:function(obj, whichedge){
var edgeoffset=0
if (whichedge=="rightedge"){
var windowedge=this.ie && !window.opera? this.iecompattest().scrollLeft+this.iecompattest().clientWidth-15 : window.pageXOffset+window.innerWidth-15
this.dropmenuobj.contentmeasure=this.dropmenuobj.offsetWidth
if (windowedge-this.dropmenuobj.x < this.dropmenuobj.contentmeasure)  //move menu to the left?
edgeoffset=this.dropmenuobj.contentmeasure-obj.offsetWidth
}
else{
var topedge=this.ie && !window.opera? this.iecompattest().scrollTop : window.pageYOffset
var windowedge=this.ie && !window.opera? this.iecompattest().scrollTop+this.iecompattest().clientHeight-15 : window.pageYOffset+window.innerHeight-18
this.dropmenuobj.style.borderTopWidth=(edgeoffset==0)? 0 : "1px" //Add 1px top border to menu if dropping up
}
return edgeoffset
},

dropit:function(obj, e, dropmenuID){
if (this.dropmenuobj!=null){ //hide previous menu
this.dropmenuobj.style.visibility="hidden" //hide menu
}
this.clearhidemenu()
if (this.ie||this.firefox){
obj.onmouseout=function(){tabdropdown.delayhidemenu(obj); obj.className='test'}

//obj.onclick=function(){return !tabdropdown.disablemenuclick} //disable main menu item link onclick?

this.dropmenuobj=document.getElementById(dropmenuID)
this.dropmenuobj.onmouseover=function(){tabdropdown.clearhidemenu()}
this.dropmenuobj.onmouseout=function(e){tabdropdown.dynamichide(e, obj)}
this.dropmenuobj.onclick=function(){tabdropdown.delayhidemenu(obj)}
this.showhide(this.dropmenuobj.style, e, obj)
this.dropmenuobj.x=this.getposOffset(obj, "left")
this.dropmenuobj.y=this.getposOffset(obj, "top")
this.dropmenuobj.style.left=this.dropmenuobj.x-this.clearbrowseredge(obj, "rightedge")+"px"
this.dropmenuobj.style.top=this.dropmenuobj.y-this.clearbrowseredge(obj, "bottomedge")+obj.offsetHeight+"px"
this.previousmenuitem=obj //remember main menu item mouse moved out from (and into current menu item)

}
},


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

dynamichide:function(e, obj2){ //obj2 refers to tab menu item mouse is currently over
var evtobj=window.event? window.event : e
if (this.ie&&!this.dropmenuobj.contains(evtobj.toElement))
this.delayhidemenu(obj2)
else if (this.firefox&&e.currentTarget!= evtobj.relatedTarget&& !this.contains_firefox(evtobj.currentTarget, evtobj.relatedTarget))
this.delayhidemenu(obj2)
},

delayhidemenu:function(obj2){
this.delayhide=setTimeout(function(){tabdropdown.dropmenuobj.style.visibility='hidden'; if (obj2.parentNode.className.indexOf('default')==-1) obj2.parentNode.className=''; obj2.className='test';},this.disappeardelay) //hide menu
},

clearhidemenu:function(){
if (this.delayhide!="undefined")
clearTimeout(this.delayhide)
},

initializetabmenu:function(menuid, opt_selectedmenuitem){
var menuitems=document.getElementById(menuid).getElementsByTagName("td")
for (var i=0; i<menuitems.length; i++){
if (parseInt(opt_selectedmenuitem)==i)
menuitems[i].parentNode.className+=" selected default"
if (menuitems[i].getAttribute("rel")){
var relvalue=menuitems[i].getAttribute("rel")
menuitems[i].onmouseover=function(e){
this.className="test2"
var event=typeof e!="undefined"? e : window.event
tabdropdown.dropit(this, event, this.getAttribute("rel"))
}
if (tabdropdown.downsymbol!="")
menuitems[i].innerHTML+=tabdropdown.downsymbol //Add symbol HTML to menu item's.
}
}
}

}