img = new Array();
alt = new Array();
link = new Array();

img[0] = "/2012/1/1323.jpg";
img[1] = "/2012/1/1293.jpg";
img[2] = "/2012/1/1297.jpg";

alt[0] = "";
alt[1] = "";
alt[2] = "";

link[0] = "/";
link[1] = "/";
link[2] = "/";

n = Math.floor(Math.random()*img.length);

document.write("<a href='"+link[n]+"'>");
document.write("<img src='"+img[n]+"' border='0' alt='"+alt[n]+"' />");
document.write("</a>");