Var Assignment

I have a var in a javascript like so:
<script language="javascript">

var timerID = null;
var timerRunning = false;
var timeIncrement = 0;
LATER in the code I need to assign a session var to the local var like
so....

timeIncrement = session("incTime")

How do I do this?

I keep getting errors like "an exception of type MS jscript runtime...
Object expected was not handled"