//DD Tab Menu- Script rewritten April 27th, 07: http://www.dynamicdrive.com
//**Updated Feb 23rd, 08): Adds ability for menu to revert back to default selected tab when mouse moves out of menu
//**Updated May 12th, Added check for sub-menu.
//Only 2 configuration variables below:

var ddtabmenu={
  disabletablinks: false, //Disable hyperlinks in 1st level tabs with sub contents (true or false)?
  snap2original: [true, 300], //Should tab revert back to default selected when mouse moves out of menu? ([true/false, delay_millisec]

  currentpageurl: window.location.href.replace("http://"+window.location.host, "").replace(/^\//, ""), //get current page url (minus hostname, ie: http://www.dynamicdrive.com/)

definemenu:function(tabid, dselected){
  this[tabid+"-menuitems"]=null
  this[tabid+"-dselected"]=-1
  this.addEvent(window, function(){ddtabmenu.init(tabid, dselected)}, "load")
},

showsubmenu:function(tabid, targetitem){
  var menuitems=this[tabid+"-menuitems"]
  this.clearrevert2default(tabid)
 for (i=0; i<menuitems.length; i++){
    menuitems[i].className=""
    if (typeof menuitems[i].hasSubContent!="undefined")
      document.getElementById(menuitems[i].getAttribute("rel")).style.display="none"
  }
  targetitem.className="current"
  if (typeof targetitem.hasSubContent!="undefined")
    document.getElementById(targetitem.getAttribute("rel")).style.display="block"
},

isSelected:function(menuurl){
  var menuurl=menuurl.replace("http://"+window.location.host, "").replace(/^\//, "")
  return (ddtabmenu.currentpageurl.indexOf(menuurl.replace(".aspx","")) != -1)
},

isContained:function(m, e){
  var e=window.event || e
  var c=e.relatedTarget || ((e.type=="mouseover")? e.fromElement : e.toElement)
  while (c && c!=m)try {c=c.parentNode} catch(e){c=m}
  if (c==m)
    return true
  else
    return false
},

revert2default:function(outobj, tabid, e){
  if (!ddtabmenu.isContained(outobj, tabid, e)){
    window["hidetimer_"+tabid]=setTimeout(function(){
      ddtabmenu.showsubmenu(tabid, ddtabmenu[tabid+"-dselected"])
    }, ddtabmenu.snap2original[1])
  }
},

clearrevert2default:function(tabid){
 if (typeof window["hidetimer_"+tabid]!="undefined")
    clearTimeout(window["hidetimer_"+tabid])
},

addEvent:function(target, functionref, tasktype){ //assign a function to execute to an event handler (ie: onunload)
  var tasktype=(window.addEventListener)? tasktype : "on"+tasktype
  if (target.addEventListener)
    target.addEventListener(tasktype, functionref, false)
  else if (target.attachEvent)
    target.attachEvent(tasktype, functionref)
},

init:function(tabid, dselected){
  var menuitems=document.getElementById(tabid).getElementsByTagName("a")
  this[tabid+"-menuitems"]=menuitems
  for (var x=0; x<menuitems.length; x++){
    if (menuitems[x].getAttribute("rel")){
      this[tabid+"-menuitems"][x].hasSubContent=true
      if (ddtabmenu.disabletablinks)
        menuitems[x].onclick=function(){return false}
      if (ddtabmenu.snap2original[0]==true){
        var submenu=document.getElementById(menuitems[x].getAttribute("rel"))
        menuitems[x].onmouseout=function(e){ddtabmenu.revert2default(submenu, tabid, e)}
        submenu.onmouseover=function(){ddtabmenu.clearrevert2default(tabid)}
        submenu.onmouseout=function(e){ddtabmenu.revert2default(this, tabid, e)}
      }
    }
    else //for items without a submenu, add onMouseout effect
      menuitems[x].onmouseout=function(e){this.className=""; if (ddtabmenu.snap2original[0]==true) ddtabmenu.revert2default(this, tabid, e)}
    menuitems[x].onmouseover=function(){ddtabmenu.showsubmenu(tabid, this)}
    if (dselected=="auto" && typeof setalready=="undefined" && this.isSelected(menuitems[x].href)){
      ddtabmenu.showsubmenu(tabid, menuitems[x])
      this[tabid+"-dselected"]=menuitems[x]
      var setalready=true
    }
    else if (parseInt(dselected)==x){
      ddtabmenu.showsubmenu(tabid, menuitems[x])
      this[tabid+"-dselected"]=menuitems[x]
    }
  }
}
}