AppleScript: Activate the frontmost Safari and run Javascript.

Question

I have the applescript like this below:
on run argv
  set pid to item 1 of argv
  set fileLocation to item 2 of argv
  tell application "System Events"
  set theprocs to every process whose unix id is pid
  repeat with proc in theprocs
  set the frontmost of proc to true
  using terms from application "Safari"
  set theScript to "document.querySelector(\"input[name='fileField']\").click()"
  tell (application "Safari" whose frontmost is true) to do JavaScript theScript in current tab of first window
  end using terms from
  tell proc
  keystroke "G" using {command down, shift down}
  delay 2
  key code 51
  delay 2
  keystroke fileLocation
  delay 10
  key code 52
  delay 5
  key code 52
  delay 5
  end tell
  set the frontmost of proc to false
  end repeat
  end tell
end run
The above code, set the frontmost of the given pid to true. The pid given will be of Safari. It will bringing the given pid of safari to front most. But after that this breaks in the line:
  tell (application "Safari" whose frontmost is true) to do JavaScript theScript in current tab of first window
with exception:
hacking.scpt: execution error: Can’t get application "Safari" whose frontmost of it = true. Access not allowed. (-1723)
Where I'm making mistake?

Answer 1

Hi,
you're right. The script does not compile. I don't know the reason, perhaps Shane reads the thread and knows the answer. Macscripter.net may be a good point for posting this.
A workaround: Create the whole ID-Tellblock as string and do a vanilla run script command.
tell application "Finder"
    activate
    set myApps to {"CS3", "CS4", "CS5.5"}
    set selectedApp to choose from list myApps with prompt "Choose Application:" with title "Launch Application"
    if the result is not false then
        set myApp to "Adobe InDesign " & selectedApp
        set myFile to "Applications:" & myApp & ":Scripts:Scripts Panel:Sample.jsx"
    end if
end tell
set myString to "tell application " & "\"" & myApp & "\"" & return ¬
    & "do script alias " & "\"" & myFile & "\"" & " language javascript" & return ¬
    & "end tell"
run script myString
It runs here.