var head="display:''"
img1=new Image()
img1.src="fold.gif"
img2=new Image()
img2.src="open.gif"
function change(){
	if(!document.all)
		return
	if (event.srcElement.id=="foldheader") {
		var srcIndex = event.srcElement.sourceIndex
		var nested = document.all[srcIndex+1]
		if (nested.style.display=="none") {
			nested.style.display=''
			event.srcElement.style.listStyleImage="url(images/open.gif)"
		}else{
			nested.style.display="none"
			event.srcElement.style.listStyleImage="url(images/fold.gif)"
		}
	}
}
document.onclick=change