function getposOffset(overlay, offsettype) {
	var totaloffset=(offsettype=="left")? overlay.offsetLeft : overlay.offsetTop;
	var parentEl=overlay.offsetParent;
	while (parentEl!=null) {
		totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;
		parentEl=parentEl.offsetParent;
	}
	return totaloffset;
}

function overlay(curobj, subobj) {
	if (document.getElementById) {
		var subobj=document.getElementById(subobj)
		subobj.style.left=getposOffset(curobj, "left")+"px"
		subobj.style.top=getposOffset(curobj, "top")+"px"
		subobj.style.display="block"
		return false
	} else
		return true
}

function overlayclose(subobj) {
	document.getElementById(subobj).style.display="none"
}