Stop JS caching

On my Fire fox extension I have the line:

<script type="application/x-javascript" src="http://www.c4sms.com/fireFox/getaddresses.asp" />

Basically if you are logged in it lists your addresses as a javascript array so it can be manipulated and used in the rest of the extensions code.

However, FireFox seems to cache it.  This is not a script issue, it works fine before the cache, then whatever you do it presents the same values.

I put the lines:

    Response.Expires = 60
    Response.Expiresabsolute = Now() - 1
    Response.AddHeader "pragma","no-cache"
    Response.AddHeader "cache-control","private"
    Response.CacheControl = "no-cache"

In the JS file (as it is an ASP file), but Firefox still seems to cache it.

Any ideas what I can do?  It's pretty important this is not cached.