function getElementPosition(elem)
{
   var w = elem.offsetWidth;
   var h = elem.offsetHeight;

   var l = 0;
   var t = 0;

   while (elem)
   {
     l += elem.offsetLeft;
     t += elem.offsetTop;
     elem = elem.offsetParent;
   }

   return {"left":l, "top":t, "width": w, "height":h};
}
function bubble_help(obj)
{
	var span=obj.getElementsByTagName('span')[0];
	if (span.style.display=="block")
	{
		span.style.display="none";
		obj.getElementsByTagName('u')[0].style.display="inline";
	}
	else
	{
		span.style.display="block";
		obj.getElementsByTagName('u')[0].style.display="none";
		pos = getElementPosition(span);
		if ((pos.left+pos.width)>document.body.clientWidth) {span.style.left=5;span.style.width=document.body.clientWidth-20;};
	}

}