value in div from php, reloading form

I am having one form with name and username as 2 field. In this i am checking whether the username is available or not, what I want is to dislay the message in the same line as username text box aligned,while showing message it shd show previously filled values also. I have taken two forms login.php in which i am building form and login2.php in which i am showing the value if not registered .but what is happening is I am getting two forms visible on the same page, i want to omit the first one when i go woth other

login.php

<?php 
include 'login2.php';
function form($name, $username)
{
?>
<form name="mylogin" method="post">
<table>
<tr><td>Name</td>
<td><input type="text" id="name" name="name" value="<?php echo $name?>" required></td></tr>
<tr><td>Username</td>
<td><input type="text" id="user" name="user" value="<?php echo $username?>" required></td>
<tr><td><input type="submit" name="submit" value="Username Availability Check"></td></tr>
<?php usercheck()?>
</table>
</form>
<?php
}
?>

<?php
form('','')
?>


login2.php

<?php 
function connect()
{
    mysql_connect('localhost','root','vivaksha');
    mysql_select_db('loginprac');
}
function usercheck()
    {
        if(isset($_POST['submit']))
        {
        connect();
        $name=$_POST['name'];
        $user = mysql_real_escape_string($_POST['user']);
        $check_for_username = mysql_query("SELECT user from userpage WHERE user = '$user'");
        $count = mysql_num_rows($check_for_username);
        if($count != 0)
        {

            form($name,$user);
        }
        }
    }
    /*function insert()
{
    connect();
    if(isset($_POST['submit']))
    {
        usercheck();
        $name=$_POST['name'];
        $user=$_POST['user'];
        $sql1= "INSERT INTO userpage (name,user) VALUES ('$name','$user')";
        mysql_query($sql1);
    }

}*/
?>