$(document).ready(function() {      
    function addMega(){
        $(this).addClass("hovering");
    }
    function removeMega() {
        $(this).removeClass("hovering");
    }
    var megaConfig = {
         interval: 150,
         sensitivity: 4,
         over: addMega,
         timeout: 500,
         out: removeMega
    };

    $("li.mega").hoverIntent(megaConfig);
    });