How do we set javascript values in WF procedures?

For example
-HTMLFORM BEGIN
<script>
var aa='sometext';

----some WF code to get aa??
-HTMLFORM END
how do i access the variable aa in the fex procedure?

One of 2 ways

if the HTML code is inline then
var aa='&SOMETEXT.EVAL';
if in a seperate file
var aa='!IBI.AMP.SOMETEXT;';

Hope this helps