var win = null;
function nuova(mypage,myname,w,h,scroll)
{
//w=w+20
//h=h+30
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2-30 : 0;
settings =
'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable=no'
win = window.open(mypage,myname,settings)

if(win.window.focus){win.window.focus();}
}