function pw() 
{
	return window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth
}; 

function mouseX(evt) 
{
	return evt.clientX ? evt.clientX + (document.documentElement.scrollLeft || document.body.scrollLeft) : evt.pageX;
} 

function mouseY(evt) 
{
	return evt.pageY ? evt.pageY : evt.clientY + (document.documentElement.scrollTop || document.body.scrollTop)
} 

function popUp(evt,oi) 
{
	if (document.getElementById) 
	{
		var wp = pw(); 
		dm = document.getElementById(oi); 
		ds = dm.style; 
		st = ds.visibility; 
		
		if (dm.offsetWidth) 
				ew = dm.offsetWidth; 
		else if (dm.clip.width) ew = dm.clip.width; 
		
		if (st == "visible" || st == "show") 
		{
			ds.visibility = "hidden"; 
		}
		else 
		{			
			tv = mouseY(evt)-20-dm.offsetHeight; lv = mouseX(evt) - 50; 
			
			if (lv < 2) lv = 2; 
			else if (lv + ew > wp) lv -= ew/2; 			
			
			lv += 'px';tv += 'px';  
			ds.left = lv; 
			ds.top = tv; 
			ds.visibility = "visible";
		}
	}
}