function show_submenu(page_id) {
    document.getElementById("submenu_content").innerHTML = document.getElementById("submenu-" + page_id).innerHTML;
    animate_icons($('#submenu_content div.image'));

}

var menu_opened = false;
function animate_icons(alerts) {    
    
    if(menu_opened) {
        $("div#submenu").slideToggle('fast');
    }
    menu_opened = true;
    /* Animation du conteneur */
    $("div#submenu").slideToggle('fast');
    
    /* Animation des boutons */
    for(i = 0; i < alerts.length; i++) {        
         $(alerts[i]).delay(i*100).animate({
                marginTop:  '-=180px',
                queue: false
              }, { "duration": 600, "easing": "easeOutBack" });
    }
    /*
    for(i = 0; i < alerts.length; i++) {        
         $(alerts[i]).delay(i*200).animate({
                marginTop:  '-=180px',
                queue: false
              }, 300, function () {
              });
    }*/
}