code: function(element) {
      if (!(element && element.nodeType === 1)) {
        return;
      }
      var mouseHandlers = _mouseHandlers[element.zcClippingId];
      if (!(typeof mouseHandlers === "object" && mouseHandlers)) {
        return;
      }
      var key, val, mouseEvents = [ "move", "leave", "enter", "out", "over" ];
      for (var i = 0, len = mouseEvents.length; i < len; i++) {
        key = "mouse" + mouseEvents[i];
        val = mouseHandlers[key];
        if (typeof val === "function") {
          element.removeEventListener(key, val, false);
        }
      }
      delete _mouseHandlers[element.zcClippingId];
    }
docs: Remove a `mouseover` handler function for a clipped element.
  
  @returns `undefined`
  @private