$form = "
        <table>
        <tr>
        <form onsubmit=\"return val3(this);\" action=\"index.php\" method=\"post\" enctype=\"multipart/form-data\">
        <td><input type=\"text\" name=\"find\" size=\"20\"></td>
        <td><input type=\"submit\" value=\"Искать\"></td>
        </tr></form></table>";

function val3(form) {
        if(????) return feedback(form.find,"Введите для запроса более 3 символов!");
        return true
}