rem: this._wiz.getButton("next").disabled = !oneChecked; 
add: this._wiz.canAdvance = oneChecked; 
context:   onImportItemCommand: function (aEvent)  {    var items = document.getElementById("dataSources");    var checkboxes = items.getElementsByTagName("checkbox");    var oneChecked = false;    for (var i = 0; i < checkboxes.length; ++i) {      if (checkboxes[i].checked) {        oneChecked = true;        break;      }    }    this._wiz.getButton("next").disabled = !oneChecked;  },
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/425896de2a0b9bc4de6661ea085d0f847fb0bf78/migration.js/buggy/mail/components/migration/content/migration.js