function rotateWelcomeImage() {
    var shuffle_list = ["company", "student",  "university"];
    var shuffle_time = 9000;
    var shuffle_effect = 'appear';

    if (arguments.length == 1)
        var i = arguments[0];
    else
        var i = 0;
    var next = i + 1;
    if (next >= shuffle_list.length)
        next = 0;
    new Effect.toggle(shuffle_list[i], shuffle_effect, {queue: 'end'});
    new Effect.toggle(shuffle_list[next], shuffle_effect, {queue: 'end'});
    i++;
    if (i >= shuffle_list.length)
        i = 0;
    setTimeout('rotateWelcomeImage(' + i + ');', shuffle_time);
}

Event.observe(window, "load", function init() {
    rotateWelcomeImage();
});