// JScript File

var ic = 4;     // Number of alternative images

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

function setback() {
    var choice = pickRandom(ic);
    if (document.body){
        document.body.background = "images/layout/nbc_banner_" + choice + ".jpg";
    }
}