var mastertabvar=new Object()

function showsubmenu(masterid, id){
submenuobject=document.getElementById(id)
hidesubmenus(mastertabvar[masterid])
submenuobject.style.display="block"
}

function hidesubmenus(submenuarray){
for (var i=0; i<submenuarray.length; i++)
document.getElementById(submenuarray[i]).style.display="none"
}

function initializetab(tabid){
var b_selected; 
mastertabvar[tabid]=new Array()
var menuitems=document.getElementById(tabid).getElementsByTagName("li")
b_selected=false;
for (var i=0; i<menuitems.length; i++){
if (menuitems[i].getAttribute("rel")){
menuitems[i].setAttribute("rev", tabid) //associate this submenu with main tab
mastertabvar[tabid][mastertabvar[tabid].length]=menuitems[i].getAttribute("rel") //store ids of submenus of tab menu
if (menuitems[i].className=="selected"){
showsubmenu(tabid, menuitems[i].getAttribute("rel"))
b_selected=true;
}
menuitems[i].getElementsByTagName("a")[0].onclick=function(){
showsubmenu(this.parentNode.getAttribute("rev"), this.parentNode.getAttribute("rel"))
}
}
}
if (b_selected==false)
showsubmenu(tabid, 'prazdne_submenu');
}