var popup = null;
		
function createPopup(file, width, height, resize)
{
	destroyPopup();	

	popup = open(file, '', 
		'width=' + width + 
		',height=' + height + 
		',resizable=' + resize + 
		',scrollbars=yes,status=no,toolbar=no,directories=no,menubar=no,location=no');
}

function destroyPopup()
{
	if (popup != null)
	{	
		if (!popup.closed)		
			popup.close();
			
		popup = null;
	}
}