var n = 9;
pic = new Array("right_nav_pic1.jpg", "right_nav_pic2.jpg", "right_nav_pic3.jpg", "right_nav_pic4.jpg", "right_nav_pic5.jpg", "right_nav_pic6.jpg", "right_nav_pic7.jpg", "right_nav_pic8.jpg", "right_nav_pic9.jpg", "right_nav_pic10.jpg", "right_nav_pic11.jpg");

var doit = pic[Math.round(Math.random()*n)];
document.write("<img height=133 width=190 src='http://www.spartanalumnirowing.org/nav/" + doit + "' />");