Yahoo! Answers - Barkley Hound's Question

var ifrm = document.getElementById('hiddenFrame');
if(ifrm.contentWindow) {
    ifrm = ifrm.contentWindow;
} else {
    if (ifrm.contentDocument.document) {
        ifrm = ifrm.contentDocument.document;
    } else {
        ifrm = ifrm.contentDocument;
    }
}
ifrm.document.open();
ifrm.document.write(codeList);
ifrm.document.close();