validating form field if radio button is checked

Hi...

I'm Glenn, a javascripting newbie and I am having difficulties with this issue.

I have a form that makes visible a text field when a specific radio button is checked. That works. Then I validate to see if a radio button is checked before I let the form be submitted. That works.

BUT - I cannot seem to get it to validate the form field that is made visible to see if it has content or at least the proper content when the form is submitted. Can you tell me what I am doing wrong please? :)

I can give more info on what kind of validation I want done if needed, but I think my code speaks for itself

Code follows:

<script language="JavaScript">

function validateForm(){

var radio_choice = false;

for (counter = 0; counter < contact.respond.length; counter++)
{
if (contact.respond[counter].checked)
radio_choice = true;
}

if (!radio_choice)
{
alert("Please Select A way To Get In Contact With You");
return (false);
}


if (document.contact.respond[0].checked)
{
if (document.contact.email == "No account email specified")
{
alert("Please update your email in your account info before submitting this form");
document.contact.email.focus();
return false;
}
}

if (document.contact.respond[1].checked)
{
if (document.contact.email == "")
{
alert("Please enter a phone number that you can be reached at");
document.contact.telephone.focus();
return false;
}
}


return true;
}
</script>


<form name="contact" action="contact_send.asp" Method="post" onSubmit="return validateForm()">

Respond by:

<input type="radio" class="menumain" name="respond" value="email" onClick="document.getElementById('container1').style.visibility='visible';document.getElementById('container2').style.visibility='hidden';"> Email &nbsp;&nbsp;

<input type="radio" class="menumain" name="respond" value="telephone" onClick="document.getElementById('container1').style.visibility='hidden';document.getElementById('container2').style.visibility='visible';"> Telephone

<DIV id="container1">
<input type="text" size="25" class="menumain" name="email" value="<%if session("email") = "" then%>No account email specified<%else%><%=session("email")%><%end if%>" readonly>
</DIV>

<DIV id="container2">
<input type="text" size="25" class="menumain" name="telephone" value="">
</DIV>

<input type="submit" value="Send" class="button"></form>
>_< Please Help me!