var webNavigation = this.browser.webNavigation; document.getElementById("context-back") .disabled = !webNavigation.canGoBack; document.getElementById("context-forward") .disabled = !webNavigation.canGoForward;  
  initNavigationItems: function() {    var webNavigation = this.browser.webNavigation;    document.getElementById("context-back")            .disabled = !webNavigation.canGoBack;    document.getElementById("context-forward")            .disabled = !webNavigation.canGoForward;    var shouldShow = !(this.isContentSelected || this.onLink || this.onImage ||                       this.onTextInput);    this.showItem("context-back", shouldShow);    this.showItem("context-forward", shouldShow);    this.showItem("context-reload", shouldShow);    this.showItem("context-stop", shouldShow);    this.showItem("context-sep-stop", shouldShow);    // XXX: Stop is determined in browser.js; the canStop broadcaster is broken    //this.setItemAttrFromNode( "context-stop", "disabled", "canStop" );  },
5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5872/691b0217b61c2a19648b4ffd345085cb562d75a1/nsContextMenu.js/clean/browser/base/content/nsContextMenu.js