var randnum = Math.random();
var inum = 6;

var rand1 = Math.round(randnum * (inum-1)) + 1;
images = new Array
images[1] = "images/hatter/1.jpg"
images[2] = "images/hatter/2.jpg"
images[3] = "images/hatter/3.jpg"
images[4] = "images/hatter/4.jpg"
images[5] = "images/hatter/5.jpg"
images[6] = "images/hatter/6.jpg"

var image = images[rand1];