th3rmite

OK mylagoon basically to add the categories to the end of the search term you need to add a hidden field with the values that you want added to the string. The script to use would be like this:
“
<form id=”searchform” method=”get” action=”<?php echo $_SERVER[‘PHP_SELF’]; ?>”>

<input type=”text” name=”s” id=”s” size=”20″ value=”search in blog…” />
<input type=”hidden” name=”cat” value=”4,13,22″ />
</form>
“

It would be the last input tag that would do it for you
“<input type=”hidden” name=”cat” value=”4,13,22″ />”

Hope this helps.