rem: headerEntry.enclosingBox.setAttribute('collapsed', true); 
add: headerEntry.enclosingBox.collapsed = true; 
context: function showHeaderView(headerTable){  var headerEntry;  for (index in headerTable)  {    headerEntry = headerTable[index];    if (headerEntry.valid)    {      headerEntry.enclosingBox.removeAttribute('collapsed');    }    else // if the entry is invalid, always make sure it's collapsed      headerEntry.enclosingBox.setAttribute('collapsed', true);  }}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/1dc8b67ef1c6d089ea6e41113322d280cba4bbbc/msgHdrViewOverlay.js/buggy/mailnews/base/resources/content/msgHdrViewOverlay.js