Here is a litle example of...
<html>
<body onload="changeEvent()">
<script language="JavaScript">
<!--
function changeEvent() {
if (document.forms[0].items.selectedIndex == 0)
document.forms[0].subItems.selectedIndex = 1;
if (document.forms[0].items.selectedIndex == 1)
document.forms[0].subItems.selectedIndex = 0;
}
-->
</script>
<form method="POST" action>
<p><select size="1" name="items" onchange="changeEvent()">
<option>Item1</option>
<option>Item2</option>
</select><select size="1" name="subItems">
<option>SubItem1</option>
<option>SubItem2</option>
</select></p>
</form>
</body>
</html>
