function showSecretMail(obj)
{
   obj.innerHTML = '@'+(Math.round(Math.random()*999))+'hotmail';
   obj.innerHTML = 'kratina' + obj.innerHTML;
   obj.innerHTML = 'petr' + '.' + obj.innerHTML;
   obj.innerHTML = obj.innerHTML + '.com';
   obj.innerHTML = obj.innerHTML.replace(/@[0-9]{1,3}/, '@');
   obj.href = 'mailto:'+obj.innerHTML;
   obj.onclick = function () {  };
}