[impact-computers]

I'm using the code below to perform a custom search of my site, It currently searches the whole site but i want to limit it to searching one Category and its sub Categories.

It will make more sense when you see the page its used on:

http://www.impact-computers.co.uk/shop/pages.php?pageid=7

Can anyone help?

<p><FORM method="POST" action="search.php" name="productsearchform">
  <div align="center">
    <p>
      <INPUT type="hidden" name="simple_search" value="Y">
      <INPUT type="hidden" name="mode" value="search">
      <INPUT type="hidden" name="posted_data[by_title]" value="Y">
      <INPUT type="hidden" name="posted_data[by_shortdescr]" value="Y">
      <INPUT type="hidden" name="posted_data[by_fulldescr]" value="Y">
      <input type="hidden" name="posted_data[by_quickfind]" value="Y" />
      <strong>Enter Printer Name or Cartridge Number Below:    </strong></p>
    <p>
      <INPUT type="text" name="posted_data[substring]" size="16" style="border:1px inset #cccccc; color:#000000; background:#cccccc; width:128px;">
    </p>
    <p>
      
      <input type="submit" value="Search">
    </p>
    </div>
</FORM>