var ic = 4;
// Number of alternative images 
var xoxo = new Array(ic); 
// Array to hold filenames 
xoxo[0] = "http://www.twinfallsweddings.com/images/hdr_d.jpg"; 
xoxo[1] = "http://www.twinfallsweddings.com/images/hdr_a.jpg"; 
xoxo[2] = "http://www.twinfallsweddings.com/images/hdr_b.jpg"; 
xoxo[3] = "http://www.twinfallsweddings.com/images/hdr_c.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);// JavaScript Document