JavaScript

I need a hint on this validation. If a user clicks the checkbox 1 the form
FirstName and LastName should not be required.

If he clicks form 2 they should become required


<INPUT name="UserIs" type="radio" value="Old">
<INPUT name="UserIs" type="radio" value="New" checked>

<INPUT name="FirstName" type="text" value="1">
<INPUT name="LastName" type="text" value="1">


Thanks!

webuers wrote:

I need a hint on this validation. If a user clicks the checkbox 1 the form
FirstName and LastName should not be required.

If he clicks form 2 they should become required


INPUT name="UserIs" type="radio" value="Old"
INPUT name="UserIs" type="radio" value="New" checked

INPUT name="FirstName" type="text" value="1"
INPUT name="LastName" type="text" value="1"

<script type="text/javascript">
function validate(form){
if(form.UserIs[1].checked){
return form.LastName.value!="" && form.FirstName.value!=""
}
return true;
}
</script>
<form action="javascript:alert('submitted')"
onsubmit="return validate(this)">
<INPUT name="UserIs" type="radio" value="Old">Old
<INPUT name="UserIs" type="radio" value="New" checked>New
<INPUT name="FirstName" type="text">First Name
<INPUT name="LastName" type="text">Last Name
<input type="submit" value="submit">
Mick