rem: gMessagePaneFrame = top.frames['messagepane']; 
add: gMessagePaneFrame = document.getElementById("messagepane"); 
context: function GetMessagePaneFrame(){    if (gMessagePaneFrame) return gMessagePaneFrame;    gMessagePaneFrame = top.frames['messagepane'];    return gMessagePaneFrame;}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/1abe49ca36fe26d55a1c32bb2f9a232f375c30b7/msgMail3PaneWindow.js/buggy/mailnews/base/resources/content/msgMail3PaneWindow.js