var curr_camera=1;
function CheckTimeout()
{
	var h=new Date().getHours(); 
	if(h>=11&&h<22) {
		document.getElementById("webcam").style.display="block";
		document.getElementById("camera_unavailable").style.display="none";
	}
	else {
		document.getElementById("webcam").style.display="none";
		document.getElementById("camera_unavailable").style.display="block";
	}
	setTimeout("CheckTimeout();",20000);
}
function SwitchCamera()
{
	var prev_id=curr_camera-1;
	if(prev_id<1)
		prev_id=3;
	
	document.getElementById("cam"+prev_id).style.display="none";
	document.getElementById("cam"+curr_camera).style.display="block";
	curr_camera++;
	
	if(curr_camera>3)
		curr_camera=1;
		
	setTimeout("SwitchCamera();",20000);
}