add: document.getElementById('retention.keepNewMsgMinLabel').disabled = useDefault; document.getElementById('retention.keepOldMsgMinLabel').disabled = useDefault; 
context: function onUseDefaultRetentionSettings(){  var useDefault = document.getElementById("retention.useDefault").checked;  document.getElementById('retention.keepMsg').disabled = useDefault;}
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/8395/2920cfd9967be613431263ccc7275c1988c2f07e/folderProps.js/buggy/mailnews/base/resources/content/folderProps.js