jQuery - Beginning JavaScript - page 501

<input type="text" id="password" />
</td>
<td />
</tr>
<tr>
<td class="fieldname">
Verify Password:
</td>
<td>
<input type="text" id="password2" />
</td>
<td />
</tr>
<tr>
<td colspan="2" class="submit">
<input type="submit" value="Submit" />
</td>
<td />
</tr>
</table>
</form>
<script src="jquery-2.1.1.min.js"></script>
<script>
function checkUsername(e) {
e.preventDefault();
var userValue = $("#username").val();
if (!userValue) {
alert("Please enter a user name to check!");
return;
}
var parms = {
username: userValue
};
$.getJSON("ch14_formvalidator.php", parms).done(handleResponse);
}
function checkEmail(e) {
e.preventDefault();
var emailValue = $("#email").val();
if (!emailValue) {
alert("Please enter an email address to check!");
return;
}
var parms = {
email: emailValue
};
$.getJSON("ch14_formvalidator.php", parms).done(handleResponse);