Captcha Erm Error

[ajicles]

I feel bad, I made the worlds worst captcha system ever! It is a simple captcha system, it works by php getting a rand number from one to ten and then echos the number back and asks the user to enter what the number times 2 is and then there is a hidden div holding the random number and gets pass to another page that uses an if statement to see if the answer is wrong.  I was wonder what you guys have to say and any suggestions?

 

        <form  id="myform" onSubmit="return mysubmit();" enctype="multipart/form-data" action="uploadfiles.php" method="POST">
          Select file:<br>
          <input name="FileData" type="file" />
          <br>
          <br />
          For security reasons please solve the question below: <br />
          What is <?php echo $randINT; ?> + <?php echo $randINT; ?>
          <input name="captcha" type="text" />
          <br />
          <input type="submit" value="Upload" />
          <br>
          <div id="captchadata" style="visibility:hidden">
            <input name="captchadata" type="text" value="<?php $randINT = $randINT*2; echo $randINT; ?>" />
          </div>
        </form>

 

uploadfiles.php

if ($_POST['captcha'] == $_POST['captchadata']){
//correct and submits files
}
else
{
//wrong please go back and enter correctly. 
}

 

I fail lol.