Junk Query String to Avoid Caching

Question

Hi,
I'm trying to create a "junk" query string to avoid page
caching. I'm also trying to attach the query string on each refresh
of the page, since the page contains a Flash object that needs to
be refreshed each time (it's reading XML that changes regularly).
The technique I'm using in the attached code seems to work on every
browser besides Mac Firefox. On Mac Firefox, every
second refresh generates a unique query string, but every
other refresh uses the query string first generated during
that session when the page is requested without a query string. Is
there anything I should change to enforce randomness on Firefox?
You can see
Thanks!

Answer 1

I know it seems that way, but the issue is that this code is
for a Flash site. I don't think most browsers will redownload the
Flash movie, even on a refresh, unless the URL is unique. Unless
the cookie is set and the code checks for it, the browser will
request the same url on a refresh, so updates to the Flash movie
might not be reflected.
Also, I'm not sure if the last line is redundant. In order to
work correctly, the value of the cookie needs to be reset on each
refresh, and the first cfelseif clause won't accomplish that (it'll
only assign the value if no cookie already exists, and is really
only a failsafe in case the page is refreshed before a cookie is
set).
Also, if I just use:
<cflocation url="index.cfm?noCache=#Rand('SHA1PRNG')#">
at the top, won't that just create an infinite loop of
redirects?
I might be missing something here though, please let me know
if I am.
Thanks for all the help so far!