Applescript based app: Hiding a button in the UI if a certain file exists

Hope someone can help,
I'm writing a small app which can be used to easily configure printers in a school environment. I have designed the applescript-based app in xcode and it is working well.
I now wish to improve driver support for the app. I am installing each printer with the lpadmin command, and have had a reasonable amount of success with this too. But...
The app sources the drivers from /usr/share/cups/model. I need to have the app detect whether the driver(s) have been copied to the model dir, and if it can see them, hide the "Install Drivers" button in the UI.
So basically, in an applescriptish tongue,
if /usr/share/cups/model/2100.ppd exists then
enable button "Install drivers"
end if
Wow, hope thats not too confusing!
Hope you can help me to do this!

You could try something like this:
set exists_ to driverInstalled("/usr/share/cups/model/2100.ppd")
if exists_ then
set enabled of button "installButton" of window "main" to false
end if
-- OR --
if exists_ then
set hidden of button "installButton" of window "main" to true
end if
on driverInstalled(thePOSIXPath)
try
set thePath to ((thePOSIXPath as POSIX file) as alias)
return true
on error
return false
end try
end driverInstalled
You could try either of those options, though the hidden option is only available in OS X 10.3 and later. Also, I've only guessed at the syntax, since I moved on from AppleScript Studio to Objective C a while ago. This script assumes that you have a window whose AppleScript name is "main" and directly in it is a button whose AppleScript name is "installButton".
Hope this helps....
Dual 2.7GHz PowerPC G5 w/ 2.5 GB RAM; 17" MacBook Pro w/ 2 GB RAM - Mac OS X (10.4.8)

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