jQuery(function($) {
var timer;
function menu_appare(event)
{
     $("#menuback").css("top","-2050px");
    $("#menuback").animate({"top":-21},2900, "easeInBounce", null);
   }

function menu_appare2(event)
{
     clearTimeout(timer);
     timer = setTimeout(eval("menu_appare"),"1919");
     $("#menuback").css("visibility","visible");
}
menu_appare2();
menu_appare();



});