var id = 18; // Total number of images
var ranimage = new Array(id); // Array to hold the filenames

ranimage[0] = "images/random/pic01.jpg";
ranimage[1] = "images/random/pic02.jpg";
ranimage[2] = "images/random/pic03.jpg";
ranimage[3] = "images/random/pic04.jpg";
ranimage[4] = "images/random/pic05.jpg";
ranimage[5] = "images/random/pic10.jpg";
ranimage[6] = "images/random/pic11.jpg";
ranimage[7] = "images/random/pic12.jpg";
ranimage[8] = "images/random/pic13.jpg";
ranimage[9] = "images/random/pic14.jpg";
ranimage[10] = "images/random/pic15.jpg";
ranimage[11] = "images/random/pic16.jpg";
ranimage[12] = "images/random/pic17.jpg";
ranimage[13] = "images/random/pic18.jpg";
ranimage[14] = "images/random/pic19.jpg";

function choseRandom(range) {
if (Math.random)
return Math.round(Math.random() * (range-1));
else {
var now = new Date();
return (now.getTime() / 1000) % range;
}
}
//
var choice = choseRandom(id);