Object Within Form has no Properties

[cweaver]

I've declared a form:
<FORM action="#" name="Selections">
and I remember to close it!

And I've place some checkboxes within the form:
<INPUT type=checkbox name="AudioChoices" value="1"/>

And I've written a bit of JavaScript:
<script type="text/javascript">
var df=document.forms;
var vCollection = document.getElementsByName('AudioChoices');
var CheckedItems;
function PlaySelected()
{
var First = true;
for (var i = 1; i < vCollection.length; i++){
if (df["Selections"][i].checked) {
if (First) {
CheckedItems = df["Selections"][i].value;
First = false;
}
else{
CheckedItems = CheckedItems + ", " + df["Selections"][i].value;
}
}
}
getMedia('ATC', '24-Jan-2005', CheckedItems, 'WM,RM'); }
</script>

The idea is that the user makes some selections and then the JavaScript takes action on the selections made. The problem is this:
Error: df.Selections[i] has no properties

Any ideas on why?

[glenngv]

<script type="text/javascript">
function PlaySelected()
{
  var vCollection = document.forms['Selections'].elements['AudioChoices'];
  var CheckedItems = '';
  for (var i = 0; i < vCollection.length; i++){
    if (vCollection[i].checked) {
      if (CheckedItems == '') {
        CheckedItems = vCollection[i].value;
      }
      else{
       CheckedItems += ", " + vCollection[i].value;
      }
    }
  }
  getMedia('ATC', '24-Jan-2005', CheckedItems, 'WM,RM'); 
}
</script>

[Kor]

Any ideas on why?

you misstyped the element

document.forms[0].elements['Selections'][i]
if the checked radio collection has name "Selections"
or
document.forms['Selections'].elements['AudioChoices'][i];
if form as called Selections and tyhe radios are AudioChoices