JQuery UI Update - 31/01/2009 @ 17:15
The bug is not in jQuery UI 1.5.3, but just that 1.5.3 is only compatible with 1.2.6. Only 1.6rc5+ is compatible with jQuery 1.3
Therefore to use JQuery with JQuery UI from the Google Ajax Libraries hosted service you need to do one of the following:
Google Library loading
google.load("jquery", "1.2.6"); google.load("jqueryui", "1.5.3");
This may be a know issue but I thought a small post on the matter might save other people a bit of time. I did have a look at raising a bug but there appears to be a bug in the bug tracking system.