//menu
var lastmainlevel;
$(document).ready(function () {
    $('li.mainlevel').mousemove(function () {
        if (lastmainlevel != undefined) {
            lastmainlevel.find('ul').stop(false,true);
        }
        $(this).find('ul').slidedown(); //you can give it a speed
    });
    $('li.mainlevel').mouseleave(function () {
        $(this).find('ul').slideup("fast");
        lastmainlevel = $(this);
    });
});