var a = '%3C%61%20%68%72%65%66%3D%22%2F%70%72%6F%6D%6F%2F%22%3E%49%6D%70%72%69%6E%74%3C%2F%61%3E%3C%62%72%20%2F%3E';
document.open();
document.write(unescape(a));
document.close();