function PopUp(num,w,h) {
var Option = 'width='+w+',height='+h+',scrollbars=yes,resize=yes';
var X = (screen.width - w) / 2 ;
X -= 10;
var Y = (screen.height - h) / 2;
Y -= 30;
Option += ',left=' + X + ',screenX=' + X;
Option += ',top=' + Y + ',screenY=' + Y;
var Fenetre = window.open(num,'f1',Option);
}