window.onload = function(){
	var img = document.getElementById('Booth');
	document.getElementById('top01').onmouseover = function(){img.src = 'images/top_swap1.jpg';}
	document.getElementById('top02').onmouseover = function(){img.src = 'images/top_swap2.jpg';}
	document.getElementById('top03').onmouseover = function(){img.src = 'images/top_swap3.jpg';}
	document.getElementById('top04').onmouseover = function(){img.src = 'images/top_swap4.jpg';}

	document.getElementById('machine').onmouseout = function(){img.src = 'images/top_swap0.jpg';}
}