Prompt not working after changing selections /w Javascript

[Dulanic]

I have a prompt page /w a checkbox group. I used the code from:

http://www.cognoise.com/index.php?topic=17818.0

I added this to the page:

Code Select Expand

<script language="javascript">
function clickDeselectAll()
{
   var checkbox = window.event.srcElement.parentNode.parentNode.parentNode.parentNode.parentNode;
   checkbox.getElementsByTagName("a")[1].click();
   window.event.srcElement.ariaChecked=true;
   window.event.srcElement.checked=true;
   window.event.srcElement.parentNode.className += " " + 'dijitCheckBoxChecked';
}

function uncheckAll()
{
   var checkbox = window.event.srcElement.parentNode.parentNode.parentNode.parentNode.parentNode;
   checkbox.getElementsByTagName('input')[0].checked="";
   checkbox.getElementsByTagName('input')[0].ariaChecked="false";
   checkbox.getElementsByTagName('input')[0].parentNode.className = "dijitInline dijitCheckBox";
}
</script>

Along /w this:

Code Select Expand

<script>
var checkboxes = document.getElementById('Prompt1').getElementsByTagName('input');
checkboxes[1].attachEvent('onclick',clickDeselectAll);

var i = 0;
for (i=2;i<checkboxes.length;i++)
{
checkboxes[i].attachEvent('onclick',uncheckAll);
}
</script>


It works great... except for when they click the top option "None"... it deselects all except the top option "None" but then the prompt button is grayed out.. like it isn't registering that None is selected?