context:     initTarget: function(id, sGroup, config) {        // configuration attributes        this.config = config || {};        // create a local reference to the drag and drop manager        this.DDM = YAHOO.util.DDM;        // initialize the groups array        this.groups = {};        // set the id        this.id = id;        // add to an interaction group        this.addToGroup((sGroup) ? sGroup : "default");        // We don't want to register this as the handle with the manager        // so we just set the id rather than calling the setter.        this.handleElId = id;        YAHOO.util.Event.onAvailable(id, this.handleOnAvailable, this, true);        // the linked element is the element that gets dragged by default        this.setDragElId(id);        // by default, clicked anchors will not start drag operations.        // @TODO what else should be here?  Probably form fields.        this.invalidHandleTypes = { A: "A" };        this.invalidHandleIds = {};        this.invalidHandleClasses = [];        this.applyConfig();    },
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