add: var backButton = document.getElementById("back"); backButton.setAttribute("disabled", "true"); 
context: function ShowImportResultsRaw(title, results, good){  SetDivText("status", title);  var header = document.getElementById("header");  header.setAttribute("description", title);  dump("*** results = " + results + "\n");  attachStrings("results", results);  var deck = document.getElementById("stateDeck");  deck.setAttribute("selectedIndex", "3");  var nextButton = document.getElementById("forward");  nextButton.label = nextButton.getAttribute("finishedval");  nextButton.removeAttribute("disabled");  var cancelButton = document.getElementById("cancel");  cancelButton.setAttribute("disabled", "true");  // If the Local Folder is not existed, create it after successfully   // import "mail" and "settings"  var checkLocalFolder = (top.progressInfo.importType == 'mail' || top.progressInfo.importType == 'settings') ? true : false;  if (good && checkLocalFolder && !top.progressInfo.localFolderExists) {    var messengerMigrator = Components.classes["@mozilla.org/messenger/migrator;1"].getService(Components.interfaces.nsIMessengerMigrator);    if (messengerMigrator)      messengerMigrator.createLocalMailAccount(false);  }}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/8b256326b430ac0b6977cb22909e49fac1a90517/importDialog.js/clean/mailnews/import/resources/content/importDialog.js