var t = 2 // interval in seconds
imgsrc = "";
 
function LoadImg() {
 	if (imgsrc == "") imgsrc = document.images.webcam.src;
 	document.images.webcam.onload = "";
 	tmp = new Date();
 	tmp = "?"+tmp.getTime();
 	document.images.webcam.src = imgsrc+tmp;
 	setTimeout("LoadImg()", t*1000);
}