var ii=new Array();
ii[10]=new Image(); ii[10].src="images/top_img1.jpg";
ii[11]=new Image(); ii[11].src="images/top_img2.jpg";
ii[12]=new Image(); ii[12].src="images/top_img3.jpg";
ii[20]=new Image(); ii[20].src="images/top_img1o.jpg";
ii[21]=new Image(); ii[21].src="images/top_img2o.jpg";
ii[22]=new Image(); ii[22].src="images/top_img3o.jpg";
function chg1(na,nu){document.images[na].src=ii[nu].src;}
function chg2(na,nu){document.images[na].src=ii[nu].src;}