Having An HTML Checkbox Call A JavaScript Function

ClickBank requires for recur bill products to have a checkbox that the value is sent to the ClickBank payment processing that indicates whether the customer accepted (checked) or declined (not checked) the billing agreement.  ClickBank gives the following code as an example:

<script type="text/javascript">
function toggleAccept() {
var acceptLink = document.getElementById("accept");
var agreeCheckbox = document.getElementById("agreeCheckbox");
if (agreeCheckbox.checked) {
acceptLink.onclick=function() {
window.location=this.href + "&cbrblaccpt=true";
return false;
}
} else {
acceptLink.onclick=function() {
mustAccept();
return false;
}
}
}
function mustAccept() {
window.alert("By clicking accept, you agree to the payment terms of this recurring product.");
}

cbrblaccptl

</script>

My HTML/JavaScript is a bit rusty.  How would I set up the checkbox in HTML to call the above code?

Thanks,