add:   var folderCharsetList = document.getElementById("folderCharsetList"); gMsgFolder.charset = folderCharsetList.getAttribute("data"); gMsgFolder.charsetOverride = document.getElementById("folderCharsetOverride").checked; 
context: function folderPropsOKButtonCallback(){  if (gMsgFolder)  {    if (document.getElementById("selectForDownload").checked)	      gMsgFolder.setFlag(0x8000000);    else      gMsgFolder.clearFlag(0x8000000);  }  window.close();}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/7edc5ec6cfb3e843ad1c3ae38c2989b1d43f59d8/folderProps.js/clean/mailnews/base/resources/content/folderProps.js