gistfile1.js

<form action="http://imageshack.us/rest_api/v2/user" method="POST">

<input value="" type="text" size="26" name="email" placeholder="Enter your email address" style="
    border:  solid 1px #ccc;
    height: 30px;
    width: 250px;
    border-radius: 4px;
    padding: 0 7px;
">
<input type="hidden" name="action" value="register">
<input type="hidden" name="set_cookie" value="1">
<input type="hidden" name="smartphone_contest" value="1">

<script type="text/javascript">
    var trackMe;
    
    if (Math.random() < 0.5) {
        document.writeln('Something');
        trackMe = "SignUp2";
    } else {
        trackMe = "Signup";
    }
</script>


<input type="submit" value="Sign Up" onclick="pageTracker._trackEvent('Contest',trackMe);" style="
    background: #333;
    color: white;
    border: none;
    border-radius: 4px;
    height: 30px;
    padding: 0 10px;
    cursor: pointer;
    position: relative;
    left: 3px;
    top: 2px;
    font-size: 13px;
"> 

</form>