JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://code.jquery.com/mobile/1.1.0/jquery.mobile-1.1.0.min.css" />
<script src="http://code.jquery.com/jquery-1.6.4.min.js"></script>
<script src="http://code.jquery.com/mobile/1.1.0/jquery.mobile-1.1.0.min.js"></script>

<div data-role="page">
<div data-role="content">
<form onSubmit="return validateForm();" method="get" action="TestPage.html" data-ajax="false">
    <div id="centralPoint" class="frame">
        <select id="centralPointSelect" data-inline="true" data-mini="true" data-native-menu="false" name="centralPoint"></select>
    </div>
    <div id="credentialsFrame" class="frame">
        <input id="userField" type="text" name="Username" />
        <input id="passField" type="password" name="Password" />
    </div>
    <div id="errorMsg"></div>
    <input id="loginBtn" type="submit" value="Login" />
    <div id="rememberMe" class="frame">
        <input type="checkbox" id="checkbox-1" class="custom" data-mini="true" name="rememberMe" />
        <label for="checkbox-1">Keep me signed in</label>
    </div>
    <div id="forgotPassFrame">
        <input id="forgotPass" type="button" data-mini="true" value="Forgot password?" />
    </div>
</form>
</div>
</div>

JavaScript

function validateForm()
{
    var usernameTxt = $("#userField").attr("value");
    var passwordTxt = $("#passField").attr("value");

    if (usernameTxt == "" || passwordTxt == "" || (usernameTxt == userLbl && passwordTxt == passLbl))
    {
        $("#errorMsg").html("Please enter a username and password.");
        return false;
    }
}