sure - what did you do til now?
The main two files to edit are theses two
/include/modules/pages/advanced_search_results/header_php.php
/include/modules/pages/advanced_search/header_php.php

and of course the template for the search site...

i think in this thread there is all the information you need, but not nicely structured - so if you post your changes to the 2 files above i`ll have a look at it!