img = new Array();
img[0] = "img/baseball_c_02.jpg";
img[1] = "img/baseball_c_01.jpg";
img[2] = "img/baseball_c_19.jpg";
img[3] = "img/baseball_c_11.jpg";
img[4] = "img/baseball_c_13.jpg";
n = Math.floor(Math.random()*img.length);
document.write("<img src='"+img[n]+"' border='0'>");