rem: node = document.getElementById("headerPart2"); 
add:  node = document.getElementById("expandedHeaderView"); 
context: function HideMessageHeaderPane(){  msgPaneData.ViewAllHeadersToolbar.setAttribute("collapsed", "true");  msgPaneData.ViewAllHeadersBox.setAttribute("collapsed", "true");  var node = document.getElementById("headerPart1");  if (node)    node.setAttribute("collapsed", "true");  node = document.getElementById("headerPart2");  if (node)    node.setAttribute("collapsed", "true");  node = document.getElementById("headerPart3");  if (msgPaneData.UserAgentToolbar)    msgPaneData.UserAgentToolbar.setAttribute("collapsed", "true");}
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/c686cc9c61e4bd3b66ea3bb1d7571dee2ed4a77c/msgHdrViewOverlay.js/buggy/mailnews/base/resources/content/msgHdrViewOverlay.js