if(document.images) {
		

		normal = new Image();
		normal.src = "default.jpg";
				
		nihongo = new Image();
		nihongo.src = "nihongo.jpg";
		
		cityscape = new Image();
		cityscape.src = "cityscape.jpg";
		
		family = new Image();
		family.src = "family.jpg";
		
		wakeup = new Image();
		wakeup.src = "wakeup.jpg";
		
		chimai = new Image();
		chimai.src = "chimai.jpg";
		
		seattle = new Image();
		seattle.src = "seattle.jpg";
		
	
	}
	
	function imgOn(imgName) {
	        if (document.images) {
	            document.sitePreview.src = eval(imgName + ".src");
	        }
	}

	function imgOff() {
	        if (document.images) {
	            document.sitePreview.src = normal.src;
	        }
	}