CMS Made Simple Forums

Can someone please help me how to change SEARCH template..border to be different color
instead of blue, change submit button into image..

Following is not working at all.
$this->smarty->assign('submitbutton', $this->CreateInputSubmit($id, 'submit', $submit));
change to
$this->smarty->assign('submitbutton', $this->CreateInputSubmit($id, 'submit', $submit, '', 'uploads/images/golf/go.jpg'));

I don't even have first line in my 1.2 CMSMS edition..?

Please someone help me!

Thanks