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, subobjstr, opt_position)
{
	if (document.getElementById)
	{	var subobj=document.getElementById(subobjstr);
		subobj.style.display = (subobj.style.display!="block")? "block" : "none";
		var xpos = getposOffset(curobj, "left")+((typeof opt_position!="undefined" && opt_position.indexOf("right")!=-1)? -(subobj.offsetWidth-curobj.offsetWidth) : 0);
		var ypos = getposOffset(curobj, "top")+((typeof opt_position!="undefined" && opt_position.indexOf("bottom")!=-1)? curobj.offsetHeight : 0);
		subobj.style.left = xpos+"px";
		subobj.style.top = ypos+"px";
		return false;
	}
	else
		return true
}

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