var wh;
function wopen(url,title,attributes)
{
//	window.open(url,title,attributes);
	if(wh==undefined || wh.closed)
	{
		wh = window.open(url,title,attributes);
		if(wh==undefined)
		{
			wh = window.open(url,title,attributes);
		}
	}
	else
	{
		wh.focus();
	}
	if(wh)
	{
		return wh;
	}
	return false;
}