// create a new array and assign images to 6 elements
var pix = new Array;
pix[0] = "images/rotate/kellyjohnston-mini.jpg";
pix[1] = "images/rotate/chillair_mini.jpg";
pix[2] = "images/rotate/uglytrucks-mini.jpg";
pix[3] = "images/rotate/chillair_mini.jpg";
pix[4] = "images/rotate/bingo_mini.jpg";
pix[5] = "images/rotate/kelmor-mini.jpg";
pix[6] = "images/rotate/aaa-mini.jpg";

// get a random integer between 0 and 5
var rand = Math.floor(Math.random() * 7);

// assign random image to the HTML <img> tag of pic id 
document.getElementById("pic1").src = pix[ rand ];