I'm also having the same problem while posting.
Hey Jonathan I was able to get my background image to show up, which is great.
The only problem now is I cannot get the
to go away.
So even though my button has the proper image it is still saying "Search" on my button as well.
I still have not been able to find any information on how to change the value of the submit button with sitefinity's search widget. Thanks for any help.