function do_Register(){
          global $db, $prefix, $username, $password, $password2, $email, $fullname, $sex, $usercolour, $user_taken_err, $email_taken_err;
          global $site_name, $site_email, $site_url;
          
          //this function will check fields incase of javascript not working.
          if((!$username) || (!$password) || (!$password2) || (!$email)){

                if(trim(empty($username))){

                }
                if(empty($password)){

                }
                if(empty($password2)){

                }
                if(trim(empty($email))){

                }
                //print the error message and load the form.

include("header.php");
				register_form();
				
                echo "<table width=\"386\" border=\"0\" cellpadding=\"2\" cellspacing=\"2\">
  <tr align=\"center\">
    <td class=\"error\">"._ERROR_PLEASE_FILL_FIELDS."</td>
  </tr>
</table>";
                
include("footer.php");
                exit();
          }
          //this code will check if the 2 passwords are match or not.
          if($password != $password2){
                //print the error message and load the form.

include("header.php");
                register_form();
                echo "<table width=\"386\" border=\"0\" cellpadding=\"2\" cellspacing=\"2\" >
  <tr align=\"center\">
    <td class=\"error\">"._ERROR_PASSWORD_DOESNT_MATCH."</td>
  </tr>
</table>";
include("footer.php");

                exit();
          }
          //this code will check if the email is correct or not
          if(!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $email)){
                //print the error message and load the form.

include("header.php");
                register_form();
                echo "<table width=\"386\" border=\"0\" cellpadding=\"2\" cellspacing=\"2\" >
  <tr align=\"center\">
    <td class=\"error\">"._ERROR_INVALID_EMAIL."</td>
  </tr>
</table>";
include("footer.php");
                exit();
          }

$username = "e/&///0799";  //Skjønner ikke hva den er for, de tegnene!
preg_match("/^[a-z0-9]+$/i", $username); 

                echo "Feil: Brukernavnet innholder spesielle tegn!"; 

                exit(); 
          }