function popup(URL, height, width, name)
	{
		if (URL==""){  
			alert("The URL for the popup function cannot be blank"); 
			return;
		}
		var returnWindow
		if ((height==null)||width==null) {
			returnWindow=window.open(URL,name);
			
		}else{
			returnWindow=window.open(URL,name,'width=' + width + ',height=' + height +',resizable=yes,top=0,left=0');
			
		}
		
		
		
	}