Javascript Submenu

[squeakypants]

What is the best way to make a javascript (therefore active) submenu? The only way I found was the switch element, but it won't work for me. This is what I have:

<!--in the head-->
<script language="javascript">
	var submenu;
	var chg;
	function chgsub(chg) {
		submenu = chg;
	}
</script>

<!--where i want the submenu-->
<script language="javascript">
	switch (submenu){
	case "resume":
		document.write = "Osiris|Zelda|Comics";
	break;
}
</script>

<!--link to change submenu-->
<a href="javascript:chgsub('resume');">Resume</a>

That won't work and I can't think of any other way. I could use php, but I don't want to have to reload (i want it active). Any ideas?