var bcb = 3;
var bb = new Array(bcb);
    
    bb[0] = "http://airtravelcenter.ch/js/bwiz728.js";
    bb[1] = "http://airtravelcenter.ch/js/ectaco728.js";
    bb[2] = "http://airtravelcenter.ch/js/adcntrL.js";

    function pickRandom2(range) {
        if (Math.random)
            return Math.round(Math.random() * (range-1));
        else {
            var now = new Date();
            return (now.getTime() / 1000) % range;
        }
    }
    
        var choice2 = pickRandom2(bcb);
    document.writeln("<script src=" + bb[choice2] + ">" + "<" + "/script" + ">");