var img4 = new Image();
	var img4r = new Image();
	var img5 = new Image();
	var img5r = new Image();
	var img6 = new Image();
	var img6r = new Image();
	var img7 = new Image();
	var img7r = new Image();
	var img8 = new Image();
	var img8r = new Image();

	img4.src = "./sys-image/nb-top_13.jpg"; 
	img4r.src = "./sys-image/nb-top_13r.jpg"; 
	img5.src = "./sys-image/nb-top_14.jpg"; 
	img5r.src = "./sys-image/nb-top_14r.jpg"; 
	img6.src = "./sys-image/nb-top_15.jpg"; 
	img6r.src = "./sys-image/nb-top_15r.jpg"; 
	img7.src = "./sys-image/nb-top_16.jpg"; 
	img7r.src = "./sys-image/nb-top_16r.jpg"; 
	img8.src = "./sys-image/nb-top_17.jpg"; 
	img8r.src = "./sys-image/nb-top_17r.jpg"; 

	function cimg4(){
	document.con4.src=img4.src;
	}
	function cimg4r(){
	document.con4.src=img4r.src;
	}
	
	function cimg5(){
	document.con5.src=img5.src;
	}
	function cimg5r(){
	document.con5.src=img5r.src;
	}
	
	function cimg6(){
	document.con6.src=img6.src;
	}
	function cimg6r(){
	document.con6.src=img6r.src;
	}
	
	function cimg7(){
	document.con7.src=img7.src;
	}
	function cimg7r(){
	document.con7.src=img7r.src;
	}
	
	function cimg8(){
	document.con8.src=img8.src;
	}
	function cimg8r(){
	document.con8.src=img8r.src;
	}