narrow down the search

Hi, I have this add on script from the ecommerce site that I bought, but they dont provide support on add on scripts, I hope someone can help me out here.  The script is a simple search box, but I need to modify it to meet my need.  It is a simple search within the site with just a text box and go button right now. I want it to be able to select women, men, unisex, or on sale first, then enter in the keyword in text box, so it will arrow down the search result,  I have tried many ways but no luck . I'll be greatful for any help..thank you..

Here is the script of the search box

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<!-- Search box starts here -->
<table width="140" border="1" cellpadding="0" cellspacing="0">
<tr>
 <td><table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
 <td align="right">
 <font size="2" face="Arial, Helvetica, sans-serif"><strong>Search&nbsp;</strong> </font>
 </td>
</tr>
<tr>
 <td>
 <table cellpadding="2" cellspacing="0">
   <tr>
    <td align="right">
 <form action="Search.asp" name="search" method="get">
    <input type="Hidden" name="priceFrom" value="0">
    <input type="Hidden" name="priceUntil" value="99999">
    <input type="Hidden" name="idCategory" value="0">
    <input type="Hidden" name="withStock" value="-1">
    <input type="Hidden" name="idSupplier" value="10">
 <input type="hidden" name="resultCnt" value="10">
    <input type="Text" name="keyword" size="12">
    </form>
 </td>
    <td width="48" valign="top">
 <img src="images/search_go.gif" onclick="document.search.submit();" alt="search" width="22" height="21" border="0">
    </td>
    </tr>
 </table>
 </td>
</tr>
<tr>
 <td align="right">
 <a href="advsrca.asp">
 <img src="images/search_advanced.gif" alt="Advanced search" width="126" height="19" border="0"></a>
 </td>
</tr>
<tr>
 <td height="6"></td>
</tr>
</table></td>
</tr>
</table>
<!-- Search box ends here -->

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