Add this to your Headers if you don't have it already. If you already have it, don't add it:
<script src="/jquery.js"></script>
Footers
<script>
function search_SMC(){
//Created by Agent Moose (smcodes.smfforfree3.com)
$("td.titlebg2 form input[name='search']").parent().parent("td.titlebg2").html("<form id='searchform' name='searchform' accept-charset='ISO-8859-1' method='post' action='http://smcodes.smfforfree3.com/index.php?action=search2'><input type='text' style='width: 190px;' name='search' value='Search SMC Code Index'/><input id='brd8' type='hidden' checked='checked' value='8' name='brd[8]'/> <input type='submit' value='Search' name='submit'/></form>");
};
search_SMC();
</script>
All this will do is change the Search thingy at the top of your forum to a SMC search. If you have this code, it will make it search just the Code Index on SMC.