function openWin (url,width,height,extras) { 
	if (window.open) { 
		if (width < 0 || height < 0) { 
			newWin = window.open(url,"",extras); 
			} 
				else { 
				newWin = window.open(url,"","width="+ width +",height="+ height +","+ extras); 
				} 
		} 
			else { 
				return false; 
			} 
		}