rem: getWebNavigation().goBack(); 
add: try { getWebNavigation().goBack(); } catch(ex) { } 
context: function BrowserBack(){  getWebNavigation().goBack();  UpdateBackForwardButtons();}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/a7fd382c2900a5551cc1a790107cedd909bd951a/navigator.js/buggy/suite/browser/navigator.js