function GoWebcam(webcamID, webcamUrl, refresh) {
    webCamInterval = setInterval('ReloadPicture("' + webcamID + '","' + webcamUrl + '");', refresh);
}
function ReloadPicture(webcamID, webcamUrl) {
    var img = document.getElementById(webcamID);
    img.src = webcamUrl + '?' + Math.random();
}