rem: editBox.setAttribute("collapsed", "true"); 
add: editBox.collapsed = true; 
context: function ClearEditMessageButton() {   var editBox = document.getElementById("editMessageBox");  if (editBox)    editBox.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