setTimeout ("t_refresh()", 20000);
var t_url = 'http://www.hodkovice.info/webcam/t_image.jpg';
var url = 'http://www.hodkovice.info/webcam/image.jpg';

var forcerefresh = 0;

function t_refresh () {
    forcerefresh = forcerefresh + 1;
    document.getElementById ('t_webcam').src = t_url + "?refresh=" + forcerefresh;
    var element = document.getElementById ('lbImage');
    if (element && element.parentNode.innerHTML.search (/webcam/) > 0) {
	element.style.background = 'url("' + url + '?refresh=' +forcerefresh + '")';
    }
    setTimeout ("t_refresh()", 20000);
}