Disallowed Key Characters ?

[eluser]solid9[/eluser]
Hi guys below is the form I'm using.

Code:

<?php echo form_open("main/process_login");?>
    <?php echo form_input('$identity', 'Username');?>
    <?php echo ' '; ?>
    <?php echo form_input('$password', 'Password');?>
        <label for="remember">Remember Me:</label>
&lt;?php echo form_checkbox('remember', '1', FALSE);?&gt;
&lt;?php echo ' '; ?&gt;
&lt;?php echo form_submit('submit', 'Login');?&gt;
    &lt;?php echo form_close();?&gt;

Is there anything wrong with this form codes?
Or is it in the coockie?
I'm using the CI 2.1

Thanks in advanced.

[eluser]solid9[/eluser]
Okay problem solved I just removed the dollar signs.