// JavaScript Document

	function change_slideshow(num,img){
		document.getElementById('overlay1').style.display = "none";
		document.getElementById('overlay2').style.display = "none";
		document.getElementById('overlay3').style.display = "none";
		document.getElementById('overlay4').style.display = "none";
		
		document.getElementById('overlay'+num).style.display = "block";
		
		document.getElementById('slideShow').style.background="url("+img+")"

	}