I have the following code that displays 4 drop down menues in a table. Is there a way to submit onclick when its mixed with the PHP like this. The reason being I want all lists to display for choices, but user can only pick one.

<form action="<?=$PHP_SELF?>" method="post">
<td><SELECT name="region"><? echo "$region_block"; ?></td>
<td><SELECT name="area"><? echo "$area_block"; ?></td>
<td><SELECT name="county"><? echo "$county_block"; ?></td>
<td><SELECT name="city"><? echo "$city_block"; ?></td>