<form>
<!-- blah blah -->
<input type="submit" name="submit" value="Update Record">
<input type="submit" name="submit" value="Delete Record">
</form>
elsewhere in your script...
if ($HTTP_POST_VARS['submit'] == 'Update Record') {
// do stuff
}
if ($HTTP_POST_VARS['submit'] == 'Delete Record') {
// do other stuff
}