rem: pt.setAttribute("prefixopen", aSidebarNowOpen);   var header = document.getElementById("sidebar-title-box"); var tooltip = header.getAttribute(aSidebarNowOpen ? "tooltipclose" : "tooltipopen"); pt.setAttribute("prefixtooltip", tooltip); 
add: if (pt) { pt.setAttribute("prefixopen", aSidebarNowOpen);   var header = document.getElementById("sidebar-title-box"); var tooltip = header.getAttribute(aSidebarNowOpen ? "tooltipclose" : "tooltipopen"); pt.setAttribute("prefixtooltip", tooltip); } 
context: function SidebarSetButtonOpen(aSidebarNowOpen){  // change state so toolbar icon can be updated  var pt = document.getElementById("PersonalToolbar");  pt.setAttribute("prefixopen", aSidebarNowOpen);    // set tooltip for toolbar icon  var header = document.getElementById("sidebar-title-box");  var tooltip = header.getAttribute(aSidebarNowOpen ?                 "tooltipclose" : "tooltipopen");  pt.setAttribute("prefixtooltip", tooltip);}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/e51053493bdd4114c45081477c1fdd9d566b1837/sidebarOverlay.js/clean/xpfe/components/sidebar/resources/sidebarOverlay.js