function displayAlert()
	{	
		closeAlert();
		
		var a = document.getElementById("alertshadow");
		a.style.display = 'block';
		a.style.left = ((window.screen.width - 470) / 2)+'px';
		
		var b = document.getElementById("alertshopping");
		b.style.display = 'block';
	}
	function displayStop()
	{		
		closeAlert();
		
		var a = document.getElementById("alertshadow");
		a.style.display = 'block';
		a.style.left = ((window.screen.width - 470) / 2)+'px';

		var b = document.getElementById("alertstop");
		b.style.display = 'block';
	}
	function closeAlert()
	{
		document.getElementById("alertshopping").style.display = 'none';
		document.getElementById("alertstop").style.display = 'none';
		document.getElementById("alertshadow").style.display = 'none';
	}
	function displayAlertStart()
	{	
		var a = document.getElementById("alertstartshadow");
		a.style.display = 'block';
		a.style.left = ((window.screen.width - 470) / 2)+'px';
		var b = document.getElementById("leftpos");
		b.value = ((window.screen.width - 470) / 2)+'px';
	}
	function closeAlertStart()
	{
		document.getElementById("alertstartshadow").style.display = 'none';
	}