var ns6=document.getElementById&&!document.all?1:0

var head="display:''"
var folder=''
var lastFolder=''

function expand(curobj){
folder=ns6?curobj.nextSibling.nextSibling.style:document.all[curobj.sourceIndex+1].style
collapse()
folder.display=""
lastFolder=folder
}

function collapse(){
	if  (lastFolder !='') {
		 lastFolder.display="none"
	}
}