rem: var buttonName = prefName.substr(this.domain.length+1); 
context:   observe: function(subject, topic, prefName)  {    // verify that we're changing a button pref    if (topic != "nsPref:changed")      return;    var buttonName = prefName.substr(this.domain.length+1);    hideButton(buttonName,pref.getBoolPref(prefName))  }
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/adacb3be13e938642b4b2c1955a5d4a1c968a46f/mailWindow.js/buggy/mailnews/base/resources/content/mailWindow.js