function cambiamail (buzon, subj) {
var res = "";
for (var n = 0; n < buzon.length; n++) res += String.fromCharCode(buzon.charCodeAt(n));
if (res.indexOf('@') < 0) res = res + '@' + 'premiosantarticos.com';
location = "mail" + "to:" + res+"?subject=" + subj;
}