Why? .....is not working

http://php.flashwebhost.com/sherly/blogloginsubmit.php

Code:
<?php

if (isset($_GET['submit'])) {
    echo '<h1>Blog Login Success!!</h1>';
    echo '<br>';
    echo '<pre>';
    print_r($_GET);
    echo '</pre>';
} 
else {
    echo '
<html>
    <body>

    <h1>Visit Our Blog</h1>
    <p>Marriage Counseling -  Advice and Tip</p>
   <form method="GET" action="blogloginsubmit.php">
    Enter First Name : <input name="first name" type="text"><br>
    Enter Last Name : <input name="last name" type="text"><br>
    Enter Your Email : <input name="email" type="text"><br>
    Enter Your Password : <input name="password" type="text"><br>
     <button type="submit" name="login"> submit!</button>
    </form>
    </body>
    </html>
    '; }