function changeCaptcha()
{
    var url="/kids-learning-zone/coloring-pages/captcha.php?rand" + Math.random();
    if (document.getElementById("captcha"))
        document.getElementById("captcha").src = url;
    for (var i = 1; i <= 10; i++)
    {
        if (document.getElementById("captcha" + i))
            document.getElementById("captcha" + i).src = url;
    }
}