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.clientY ? evt.clientY + (document.documentElement.scrollTop || document.body.scrollTop) : evt.pageY
} 

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; lv = mouseX(evt) - (ew/4);
			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";
		}
	}
}