This is the JavaScript :
<script>
function checkPhoneLine(rbn) {
var ddlLline = document.getElementById("<%=ddlLandLine.ClientID%>");
var ddlMobile = document.getElementById("<%=ddlMobile.ClientID%>");
var selectedVal = null;
var radio = rbn.getElementsByTagName("input");
document.getElementById('TRProvider').style.display = 'block';
for (var i = 0; i < radio.length; i++) {
if (radio[i].checked) {
selectedVal = i;
break;
}
}
if (selectedVal == 0) {
ddlLline.style.display = 'block';
ddlMobile.style.display = 'none';
}
else {
ddlLline.style.display = 'none';
ddlMobile.style.display = 'block';
}
return true;
}
function validateForm() {
var rbn = document.getElementById("<%=rbnPhoneType.ClientID%& ...
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