Multiple checkboxes for accept terms form

Greetings....

I have a script that will enable the my "Accept Terms" submit button when the checkbox is clicked on the registration_rules in WWF .... works fantastic... But I have several check buttons I'd like to force users to click on in order to enable the Accept terms button. With the following script any checkbox selected enables the accept button, how do I force the button to be enabled only when ALL checkboxes are checked?

Any help is wildly appreciated, thanks!

<script>
var checkobj

function agreesubmit(el){
checkobj=el
if (document.all||document.getElementById){
for (i=0;i<checkobj.form.length;i++){ //hunt down submit button
var tempobj=checkobj.form.elements
if(tempobj.type.toLowerCase()=="submit")
tempobj.disabled=!checkobj.checked
}
}
}

function defaultagree(el){
if (!document.all&&!document.getElementById){
if (window.checkobj&&checkobj.checked)
return true
else{
alert("Please read/accept terms to submit form")
return false
}
}
}
</script>


<form method="post" name="frmregister" action="register.asp?FID=<% = intForumID %>" onClick="agreesubmit(this)">

That works great.... however....
How do I then process the original button value...

value="<% = strTxtAccept %><% = srtTxtAccept %>"

into that function to process the form?
<% = srtTxtAccept %><% = srtTxtAccept %>