function popup(urlPopup,nomePopup,w,h){
		var winl = (screen.width - w) / 2;
		var wint = (screen.height - h) / 2;
                   var scroll= "no" ;
		paramPopup = 'height='+h+',width='+w+',top='+wint+',left='+winl+',scrollbars='+scroll+',resizable=no'
		window.open(urlPopup,nomePopup,paramPopup);
		}