function tryPopup(url) 
{
	var popwin = window.open(url,'ImageWindow','width=820,height=620,resizable=true,scrollbars=no,toolbar=no,locationbar=no, status=no,menubar=no');
	if (popwin) 
	{
		if (window.focus) popwin.focus();
		return false;
	}
	else 
	{
		return true;
	}
}