populate listbox using Javascript

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From: RA (rchaudhary-nospam_at_storis.com)
Date: 11/12/04 

Date: Fri, 12 Nov 2004 16:16:48 -0500

I tried following :
document.getElementById("lsTest").Items.Add(new ListItem("Test"))

This gives following error message:
'document.getElementById(...).Items' is null or not an object

Also tried:
document.getElementById("lsTest").Add(new ListItem("Test"))
Result - Error Message:
'listitem' is undefined

Any idea?