draggable options not taking effect

draggable options not taking effect


hi,
i am having an issue using the draggable plugin, insofar as some
options are simply not taking effect, while others are. i have created
this test page to demonstrate the issue:
http://www.ajpiano.com/ajaxtest/testme.html
the grey box in the top right corner is our boy:
$("#mydiv").draggable({
            opacity: .1,
            helper: 'clone',
            stop:function(e,ui) {alert("stopped dragging" + ui);},
            revert:true,
            grid:[50,50]
            });
});
as you'll see in the example, i can define the various functions, and
the "helper" option works, but neither the opacity, revert, or grid
options are working. if you stop execution during the stop function,
for example, you'll see that the ui object actually has those options
defined - they're just not....happening?
this is happening in both ie and ff.
thanks for any aid.
--adam