add: document.getElementById("key_toggleMessagePane").removeAttribute("disabled"); 
context: function HideAccountCentral(){    try    {        window.frames["accountCentralPane"].location.href = "about:blank";        document.getElementById("accountCentralBox").collapsed = true;        GetThreadTree().collapsed = false;        gSearchBox.collapsed = false;        var threadPaneSplitter = document.getElementById("threadpane-splitter");        threadPaneSplitter.collapsed = false;        if (!threadPaneSplitter.hidden && threadPaneSplitter.getAttribute("state") != "collapsed")            GetMessagePane().collapsed = false;        gAccountCentralLoaded = false;    }    catch (ex)    {        dump("Error hiding AccountCentral page -> " + ex + "\n");        return;    }}
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/9feebd2a164876cab812ae184c7ee20ee6290811/mailWindow.js/buggy/mailnews/base/resources/content/mailWindow.js