[dsflyerds]

I am working on a registration page for a website I am designing. I would like the form to check the birthrate and send people who are over 13 to complete the registration and people who are under the age of 13 taken to a page where there are instructions on what to do. Is there a way to do this?
Here is my scirpt that i have so far

PHP Code:

 <?php

echo "<h1>Register</h1>";



$submit = $_POST['submit'];



$firstname = strip_tags($_POST['firstname']);

$lastname = strip_tags($_POST['lastname']);

$username = strip_tags($_POST['username']);

$password = strip_tags($_POST['password']);

$repeatpassword = strip_tags($_POST['repeatpassword']);

$birthdate = strip_tags($_POST['birthdate']);

$gamespyid = strip_tags($_POST['gamespyid']);

$base = strip_tags($_POST['base']);

$date = date ("Y-m-d");

if ($submit)

{



 //check for existance

    if($firstname&&$lastname&&$username&&$password&&$repeatpassword&&$birthdate&&       $gamespyid&&$base)

    {



        if ($password==$repeatpassword)

        {

        //check legths of other fields

        if(strlen($firstname)>25||strlen($lastname)>25||strlen($username)>25||               strlen($gamespyid)>25)

        {

        echo "Max limit for First name, Last name, and username is 25                        characters";

        }

         else

        {

        //password legnth

        if (strlen($password)>25||strlen($password)<6)

        {

         echo "Password must be between 6 and 25 characters!";

        }

        else

        {

        //register

        //encryptions of passwords

        $password = md5($password);

        $repeatpassword = md5($repeatpassword);

         echo "Success!";

        //open db<br>

        $connect = mysql_connect("localhost","*********","*******") or die ("Couldn't Connect"); //host,username,               password

        mysql_select_db("**************") or die ("Could not find database");



        $queryreg = mysql_query("



        INSERT INTO Users VALUES('','$username','$password','$firstname','$lastname','$date','$gamespyid','$base','$birthdate','')

        ");

        die ("Your have been registered!<a href='../index.php'>Home</a>");

        }

        }



        }

        else

            echo "Your passowrds do not match!";

    }

    else

        echo "Please fill in all fields!";



}//if($submit)

?>