$(document).ready(function() {
      
      function addum(){
        $(this).addClass("hovering");
        }

      function removeum(){
        $(this).removeClass("hovering");
        }

    var umConfig = {
         interval: 50,
         sensitivity: 4,
         over: addum,
         timeout: 50,
         out: removeum
    };

    $("li.um").hoverIntent(umConfig)

      
    });