checkbox problem

i have a form with a lot of checkboxes
how can i click a button or link to check all the checkboxes

you gotta use javascript to do that im pretty sure it cannot be done in html.

something like this might do it:

<script language="Javascript">
function checkAll(theForm, cName, check) {
for (i=0,n=theForm.elements.length;i<n;i++)
if (theForm.elements[i].className.indexOf(cName) !=-1)
theForm.elements[i].checked = check;
}

</script>
<form id="myform">
<input type="checkbox" class="filecheck"><br>
<input type="checkbox" class="filecheck"><br>
<input type="checkbox" class="filecheck"><br>
<input type="checkbox" class="filecheck"><br><br>
<a href="javascript:checkAll(document.getElementById('myform'), 'filecheck', true);">select all</a>&nbsp;
<a href="javascript:checkAll(document.getElementById('myform'), 'filecheck', false);">select none</a>
</form>

hope this helps.

Jon