this.randomtip = function() {

    var pause = 8000; // define the pause for each tip (in milliseconds)
    var length = $(".bottomScroller li").length;
    var temp = -1;

    this.getRan = function() {
        // get the random number
        var ran = Math.floor(Math.random() * length) + 1;
        return ran;
    };
    this.show = function() {
        var ran = getRan();
        // to avoid repeating
        while (ran == temp) {
            ran = getRan();
        };
        temp = ran;
        $(".bottomScroller li").hide();
        $(".bottomScroller li:nth-child(" + ran + ")").fadeIn("fast");
    };

    show(); setInterval(show, pause);

};

$(document).ready(function() {
    randomtip();
});