Am I missing something?

I fixed my code and it shows up fine now. It says it supposedly enters the data when I input the fields but when I check the MySQL database, the info isn't there. Here's the fixed code if you wish to test it: <html> <body> <?php function add_to_table( $picture, $thumbnail ) {

        $picture = mysql_real_escape_string($picture);
        $thumbnail = mysql_real_escape_string($thumbnail);

        $user = "user";
        $pass = "password";
        $database = "mydata";

$link = mysql_connect("localhost", $user, $pass);

       if(!$link) {
         echo 'Error in linking';
       }

        $db = mysql_select_db($database, $link);

        $insert = 'INSERT INTO domains ( picture, thumbnail ) values( $picture, $thumbnail )';
        $indata = mysql_query( $insert, $link );

} function write_form() {

        echo "<form method='post' action='{$_SERVER['PHP_SELF']}'>";

        echo "<p>Enter url of large picture: <input type='text' name='picture' />";

        echo "<p>Enter url of thumbnail: <input type='text' name='thumbnail' />";

        echo "<p><input type='submit' value='Add to Database' />";

        echo "</form>";

}

        if ( !empty( $_REQUEST['picture'] ) && !empty( $_REQUEST['thumbnail'] ) ) {
          $input = add_to_table( $_REQUEST['picture'], $_REQUEST['thumbnail'] );
            if(!input) {
              echo 'Error\!';
            }
            else {
     echo 'Data enter successfully\!';
     $idreturn = mysql_insert_id($input);
     echo 'Image inserted to ID ' . $idreturn;

} }

        else {
          write_form();

} ?> </body> </html>