When I apply a class to an element (e.g., button) the button seems to display twice as what I expect (how it displays in the UI theme gallery).  Why is this?  What can I do to correct it?

 

Some background:  I'm new to jQuery, so I'm feeling my way through implementation.  I'm designing in Lotus Domino 8.5.1.  The browsers I'm using are IE6 and FireFox 3.5.8.