function set_gravatar (mail) {
	var gravatarid = hex_md5(mail);

         document.getElementById("preview-gravatar").innerHTML =
         '<img src="http://www.gravatar.com/avatar/' + gravatarid + '?s=64&d=http%3A%2F%2Fwww.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D64&r=X" alt="" />';
}

function set_username (name) {
         document.getElementById("preview-author").innerHTML = name;
}