function captcha_reloadimage(imgID,ctrlID)
{
    var now = new Date();
    var img = document.getElementById(imgID);
    var imgSrc = img.src;
    img.src = null;

    var parts = imgSrc.split("?");
    imgSrc = parts[0];

    img.src = imgSrc + "?t=" + now.getTime();

    var ctrl = document.getElementById(ctrlID);
    ctrl.value = "";
}