var ic = 2;     // Number of alternative images
var rand = new Array(ic);  // Array to hold filenames
        
rand[0] = "bird/cardinal1.jpg";
rand[1] = "bird/cardinal.jpg";

function pickRandom(range) {
if (Math.random)
return Math.round(Math.random() * (range-1));
else {
var now = new Date();
return (now.getTime() / 1000) % range;
}
}
// Write out an IMG tag, using a randomly-chosen image name.
var choice = pickRandom(ic);