function change_image(event, link) {
    var img = link.attr("id").replace("menu_", "");
    var menu = img.substr(0,2);
    $("#img_menu_"+menu).load("/menu_image.php?name="+img);
}

$(document).ready(function() {
  $(".menu_boxes [id^='menu_']").mouseover(function(event) {
    change_image(event, $(this));
  });
});