function NewWindow(URL,name,w,h)
{
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0; 
TopPosition = (screen.height) ? (screen.height-h)/2 : 0; 
settaggi = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+''
win = window.open(URL,name,settaggi) 
// fine -->
}