on ApplicationIsRunning(appName)
    tell application "System Events" to set appNameIsRunning to exists (processes where name is appName)
    return appNameIsRunning
end ApplicationIsRunning
quit application "GrowlHelperApp"
repeat while ApplicationIsRunning("GrowlHelperApp")
    delay 0.5
end repeat
repeat while not ApplicationIsRunning("GrowlHelperApp")
    launch application "GrowlHelperApp"
    delay 2
end repeat