ihy_img=new Array();
	ihy_img[0]='changeimg/change_01.jpg';
	ihy_img[1]='changeimg/change_02.jpg';
	ihy_img[2]='changeimg/change_03.jpg';
	ihy_img[3]='changeimg/change_04.jpg';


	function ihy(){
		a=Math.floor(Math.random()*ihy_img.length);
		document.images["ihy_img"].src=ihy_img[a];
		}