something like this should help:
<FORM ACTION="page.php" METHOD="POST" ENCTYPE="application/x-www-form-urlencoded">
<input name="thisform" type="hidden" value="form01">
...other form fields...
</form>
<FORM ACTION="page.php" METHOD="POST" ENCTYPE="application/x-www-form-urlencoded">
<input name="thisform" type="hidden" value="form02">
...other form fields...
</form>
notice the difference in the hidden form fields.