Ajax - Beginning JavaScript - page 519

<style type=”text/css”>
.fieldname
{
text-align: right;
}
.submit
{
text-align: right;
}
#hiddenFrame
{
display: none;
}
</style>
<script type=”text/javascript”>
function checkUsername()
{
var userValue = document.getElementById(“username”).value;
if (userValue == “”)
{
alert(“Please enter a user name to check!”);
return;
}
var url = “iframe_formvalidator.php?username=” + userValue;
frames[“hiddenFrame”].location = url;
}
function checkUsername_callBack(data, userValue)
{
if (data == “available”)
{
alert(“The username “ + userValue + “ is available!”);
}
else
{
alert(“We're sorry, but “ + userValue + “ is not available.”);
}
}
function checkEmail()
{
var emailValue = document.getElementById(“email”).value;
if (emailValue == “”)
{
alert(“Please enter an email address to check!”);
return;
}
var url = “iframe_formvalidator.php?email=” + emailValue;
frames[“hiddenFrame”].location = url;