[jQuery] Interface Plugin draggables

[Michael Fuerst]

Hi,

I'm having a problem with the draggables:

I'm trying to get a half transparent background for the element I'm
dragging:

$('[EMAIL PROTECTED]' + strKey + ']').Draggable
    (
        {
            revert        : true,
            autoSize    : true,
            ghosting    : true,
            onStart        : function(helper)
            {
                $(helper).addClass('dragging');
            }
        }
    );

And here the css:

.dragging {
    backgound-color: #dddddd;
    filter: alpha(opacity=50);
    -moz-opacity: 0.5;
}

The class is assigned to the element, I can test this for eg with adding
a border. But the element always has a transparent background...

Michael