function light(obj,onoff)
{
	r=obj.getBoundingClientRect();
	l=document.getElementById('light');
	
	if(onoff)
	{
		l.style.top=(r.top+r.bottom-16)/2+document.body.scrollTop+document.documentElement.scrollTop+'px';
		l.style.left=r.left-14+'px';
		l.style.display='block';
		l.style.zIndex=2;
	}
	else
	{
		l.style.display='none';
	}
}