if I want to refer to the PreflistAssistant var (specifically voiceRoamingModel.currentVoiceRoaming) from /usr/palm/applications/com.palm.app.phoneprefs/app/controllers/preflist-assistant.jsjsjs $in$ /$usr$/$lib$/$luna$/$system$/$luna$-$systemui$/$app$/$controllers$/$bar$-$assistant$.$js$, $how$ $would$ $i$ $go$ $about$ $it$?