Triggering dragging in 1.3.1 & 1.6rc6

Triggering dragging in 1.3.1 & 1.6rc6


In the previous versions of jQuery & jQuey-UI, one could trigger
dragging like so:
jQuery(document).ready(function() {
    jQuery("#myDiv").mousedown(function(ev) {
        target = jQuery(ev.target);
        /* Various logic that sets the draggable variable to either true or
false */
        if (draggable) {
             target.draggable({
                 helper: "clone",
                 stop: function()
                {
                     jQuery(this).draggable("destroy");
                }
            }).trigger("mousedown.draggable", [ev]);
        }
    });
});
But it will not work, javascript reports the following error:
"event.originalEvent is undefined".
How can I fix this?