After clicking on the element I've set as the trigger for slideToggle, it moves a few pixels to the right without any apparent cause. It seems like there might be an issue with the CSS, but I'm having trouble pinpointing the exact problem.
You can see an example of this behavior here: http://jsfiddle.net/ZmyGq/. When 'Advanced Search' is clicked, it will shift slightly to the right and then return to its original position when clicked again.