rem: node.setAttribute("collapsed", "true"); 
add: node.setAttribute("hide", "true"); 
context: function HideMessageHeaderPane(){  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 (node)    node.setAttribute("collapsed", "true");}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/3fdf4e9891cb26875361235eb4e7581d346ff569/msgHdrViewOverlay.js/buggy/mailnews/base/resources/content/msgHdrViewOverlay.js