$(document).ready(function() {
    var domain = document.domain;
    var catalog = "localhost";
    if(domain=="localhost")
        catalog = "/eurowypoczynek/";
    else
        catalog = "/";
    var img = null;
    img = '<img src="' + catalog + 'kodcaptcha.php" alt="Captcha"/>';
    img += '<input type="text" name="captcha"/>';
    $("#captcha").html(img);
});