Java script

Hello, I am trying to write a small piece of javascript , and it aint going to plan.

Its on an ASP page,
<script language="JavaScript" type="text/javascript">

var frmvalidator = new Validator("mainform");

if (form1.select1 contains the letter X) then
frmvalidator.addValidation("select1")

</script>

--where form1 is the form name and select1 is a menu/list box.
I basically want to use the addValidation function only when a certain condition is met , that the menu/list box value selected contains an X.
For anyone can understand what i'm trying to say , if you have a knowledge of javascript and an idea of how to solve this problem,
please let me know,
THanks

You can get the value of the currently selected option with this line (sel is the select box):
sel.options[sel.selectedIndex].value