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: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/99d3e5bc467782e28edf03df21c2eaf617655e00/migration.js/clean/browser/components/migration/content/migration.js