IsRunning is not working

[himanshu]

PHP Code:

tell application "Finder"
    if appIsRunning("Firefox") then
        tell application "Firefox" to quit
    else
        tell application "Safari"
            set theURL to "THE URL"
            make new document with properties {URL:theURL}
            open location theURL
            
        end tell
    end if
end tell 


err: finder got err :can't continue IsRunning (-1708)

[renaultssoftware]

There's no need to tell Finder at all, is there?