function openInfoPopup(idlang) { 
    openPopup('info.php?id_lang='+idlang);
}

function openPopup(url) { 
   
   var x = (screen.width-816)/2;
   var y = (screen.height-450-32)/2;
   var option = 'titlebar=no,resizable=yes,menubar=no,scrollbars=yes,toolbar=no,location=no,status=no,width=1000,height=550,left=' + x + ',top=' + y;
   standardPopup = window.open(url,'popup',option);
   standardPopup.focus();
}

function doLoad(idlang) {    
    setTimeout('openInfoPopup('+idlang+')', 1000); // 1 seconde
}