"Check All" checkbox - works, but, it doesn't let me post the form

I have this form with lots of 'checkboxes'.

It worked fine until I implemented the javascript to 'check All'.
when the user clicks on the top checkbox, it selects all the checkboxes in the list.
And it works fine (it does select all the checkboxes when is checked or unselects when is unchecked).

However, since I've done this, the form is not posted anymore!
It doesn't go anywhere...

I've tried using some other code with different ways, but, my JS is far too basic to understand what is really going on...

this is the code - thank you!

<script language="javascript">
function checkAll(allbox) {
for (var i = 0; i < document.territory["Country_ID"].length; i++) {
document.territory["Country_ID"][i].checked = allbox.checked;
}
}
</script>

It's implemented here:

<form name="territory" method="GET" action="territory_country.asp" id="Form1">
<table border="0" cellpadding="5" cellspacing="1" align="center" width="100%">
<tr bgcolor="EEEEEE">
<td colspan="2">
<div class="popUp2"><a href="javascript:void();"><input type="checkbox" name="all" onClick="checkAll(this);">Select All</a></div>
</td>
</tr>

I presume you've got a submit button and you've closed your form tag?

Sure. That's the end of my code: (I can post the whole page if it helps)
When i click on submit button, it doesn't do anything (If check all is clicked). If check all is not clicked then, it works fine and it submits the form.

Thanks!!

Your script makes a reference to the form field "Country_ID," which doesn't exist. Also, I get an error on javascript:void() unless I pass "0" as a parameter. For js debugging, I suggest downloading Mozilla and using the js console to see errors.

Why is there a anchor (<a>) around the check box? That can't be helping.