function OnUpdateTimerCompleted(sender, args)
{
	d = Date()
	new Ajax.Request('tijd.asp?timestamp=' + d,   
	{     
		method:'get',     
		onSuccess: function(transport)
		{
			var response = transport.responseText || "no response text"
			sender.findName("Header").text = response
			startUpdateTimer(sender, args)
		},
		onFailure: function()
		{
			alert('Something went wrong...') 
		}
	}); 
}