rem: this.printengine.PrintPreview(); 
add: PrintUtils.printPreview(onEnterPrintPreview, onExitPrintPreview); 
context:   observe: function(subject, topic, prefName)  {    this.printengine.PrintPreview();  }
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/a4f9e1af6934a96549a97f99973bbe5d87847168/msgPrintEngine.js/clean/mailnews/base/resources/content/msgPrintEngine.js