rem: this.printengine.PrintPreview(); 
add: PrintUtils.printPreview(onEnterPrintPreview, onExitPrintPreview); 
context:   observe: function(subject, topic, prefName)  {    this.printengine.PrintPreview();  }
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/c94e8974ee1234ea0cafe0ff4be174099796cacb/msgPrintEngine.js/buggy/mailnews/base/resources/content/msgPrintEngine.js