rem: node.removeAttribute("hide"); 
add: node.removeAttribute("collapsed"); 
context: function ShowMessageHeaderPane(){   var node = document.getElementById("headerPart1");  if (node)    node.removeAttribute("hide");  node = document.getElementById("headerPart2");  if (node)    node.removeAttribute("hide");  node = document.getElementById("headerPart3");  if (node)    node.removeAttribute("hide");}
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/66a169ecde9845865fdc6cabf005cc4223ee6bea/msgHdrViewOverlay.js/clean/mailnews/base/resources/content/msgHdrViewOverlay.js