code: function(id) {
          if (typeof id !== "string") {
              YAHOO.log("id is not a string, assuming it is an HTMLElement");
              id = Dom.generateId(id);
          }
          this.handleElId = id;
          this.DDM.regHandle(this.id, id);
      }
docs: Allows you to specify a child of the linked element that should be
  used to initiate the drag operation.  An example of this would be if
  you have a content div with text and links.  Clicking anywhere in the
  content area would normally start the drag operation.  Use this method
  to specify that an element inside of the content div is the element
  that starts the drag operation.
  @method setHandleElId
  @param id {string} the id of the element that will be used to
  initiate the drag.