function reloadWebcam() {
	//alert('function called');
	if (!document.images) return;
	//alert('image found on page');
	if (!document.images['webcam_image']) return;
	//alert('webcam image found');
	document.images['webcam_image'].src = 'cam_1.jpg?' + Math.random();
	//alert('webcam image reloaded');
	setTimeout('reloadWebcam()',4000); // refresh every five seconds
	//alert('timeout set');
};