function popup(url,nme,hgt,wgt)
		{
		var params='toolbar=no,height='+hgt+',width='+wgt+',location=no,scrollbars=yes,status=no,menubar=no,resizable=no';
		if(self && self.screen && self.screen.width)
			{
			params+=",left="+((self.screen.width-wgt)/2);
			params+=",top="+((self.screen.height-hgt)/2);
			}
		window.open(url,nme,params);

		}