Anonymní profil peter – Programujte.com

<div id="parent_2">Tatinek</div>

<script>
x = {
  site_rule : "",
  description : "",
  tag_1 : "",
  action_1 : "",
  parent_1 : "",
  tag_2 : "",
  action_2 : "",
  parent_2 : "",
  tag_3 : "",
  action_3 : "",
  parent_3 : ""  
  }

y = {};
key = '';
o = null;
  for (key in x)
{
    o = document.getElementById(key);
     y[key] = (o && (o.value || o.innerHTML || o.text)) || x[key];
}
alert(x.toSource())
alert(y.toSource())

</script>

Mi tvuj kod normalne funguje. Jen jsem z tama vyhodil ty slozite nazvy a doplnil o existenci objektu v html.