Draggables don't work without dimensions in IE

Draggables don't work without dimensions in IE


I'm using jQuery 1.2.6 and jQuery UI 1.5 final to implement
draggables. It works fine in FireFox, but in IE any attempt to drag a
draggable results in an "invalid argument" error being thrown, unless
I include jquery.dimensions.js as well.
I was under the impression that the dimensions plugin was now
completely a prt of jQuery and the separate plugin was no longer
necessary?