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I'm not familiar with 1.3x of XOOPS but maybe it's template manager is similar to XOOPS 2x. If you have a templates manager, look for the contact template in it. There is only one template in my version of XOOPS (2.0.5.1), called contact_contactusform.html. If you have a cloned copy of your default template you can edit it.
This is what it looks like:
<{$contactform.javascript}>
<form name="<{$contactform.name}>" action="<{$contactform.action}>" method="<{$contactform.method}>" <{$contactform.extra}>>
<table class="outer" cellspacing="1">
<tr>
<th colspan="2"><{$contactform.title}></th>
</tr>
<!-- start of form elements loop -->
<{foreach item=element from=$contactform.elements}>
<{if $element.hidden != true}>
<tr>
<td class="head"><{$element.caption}></td>
<td class="<{cycle values="even,odd"}>"><{$element.body}></td>
</tr>
<{else}>
<{$element.body}>
<{/if}>
<{/foreach}>
<!-- end of form elements loop -->
</table>
</form>
Just put what you what at the very top above the <{$contactform.javascript}> and see if that works.
If you don't have this template at all, then try index.php but you really should add your extra stuff into the html template for modules if possible.