rem: function onUnload() 
add: function onUnload() 
context: function onUnload() {  if (printProgress)  {   try    {     printProgress.unregisterListener(progressListener);     printProgress = null;   }       catch( exception ) {}  }}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/2abcfc3bd3437e146a421dc9404a6e59b89a511a/printProgress.js/clean/xpfe/global/resources/content/printProgress.js