<!--popup centree  sur l'écran
function info(mypage,myname,w,h,scroll)
{
var LeftPosition = (screen.width-w)/2;
var TopPosition = (screen.height-h)/2;
var settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+', scrollbars=no,resizable=no' 
window.open(mypage,myname,settings) 
} 
//-->