button code
<input type="image" hspace="0" vspace="0" border="0" name="LogIn" id="LogIn" value="Log In" alt="Log In" src="WA_SecurityAssist/images/Pacifica/Refined_login.gif" />
Based on gif image
When you say you want to change the colour of the form could you give us some more details as in what you want to change.