var refreshrate=15;    
var image="http://www.rizi-online.de/b2e/media/webcam.jpg";  
function refresh(){    
	document.images["pic"].src=image+"?"+new Date();    
	setTimeout("refresh()", refreshrate*1000);   
	}    

if(document.images) {  
	window.onload=refresh;   
	}    

refresh();