rem: node.setAttribute("collapsed", "true"); 
add: node.collapsed = true; 
context: function HideMessageHeaderPane(){  var node = document.getElementById("collapsedHeaderView");  if (node)    node.setAttribute("collapsed", "true");  node = document.getElementById("expandedHeaderView");  if (node)    node.setAttribute("collapsed", "true");}
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/7b10439c40b4254072b774f5f2ee3fb15c693ade/msgHdrViewOverlay.js/clean/mailnews/base/resources/content/msgHdrViewOverlay.js