Check Availability

<script language="JavaScript" src="js/jquery-1.3.2.min.js" type="text/javascript">
</script>
<script language="JavaScript" src="js/jquery.validate.js" type="text/javascript">
</script>
<script>
  $(document).ready(function(){
    $.validator.addMethod("username", function(value, element) {
        return this.optional(element) || /^[a-z0-9\_]+$/i.test(value);
    }, "Username must contain only letters, numbers, or underscore.");

    $("#regForm").validate();
  });
 
</script>

<span class="Apple-style-span" style="font-weight: bold;"><strong>Login Details</strong></span>
Username<span class="required"><span style="color: #cc0000;">*</span></span>
<input class="required username" id="user_name" minlength="5" name="user_name" type="text" />
<input class="button" id="btnAvailable" name="btnAvailable" onclick="$(&quot;#checkid&quot;).html(&quot;Please wait...&quot;); $.get(&quot;http://www.blog.thexyznetwork.com/wp-content/plugins/wp-affiliate-platform/affiliates/checkuser.php&quot;,{ cmd: &quot;check&quot;, user: $(&quot;#user_name&quot;).val() } ,function(data){  $(&quot;#checkid&quot;).html(data); });" type="button" value="Check Availability" />


http://www.blog.thexyznetwork.com/wp-content/plugins/wp-affiliate-platform/affiliates/register.php