Javascript Countdown

gistfile1.js

// <b id="show-time">5</b>
<script type="text/javascript">
        var settimmer = 0;
        $(function(){
                window.setInterval(function() {
                    var timeCounter = $("b[id=show-time]").html();
                    var updateTime = eval(timeCounter)- eval(1);
                    $("b[id=show-time]").html(updateTime);

                    if(updateTime == 0){
                        window.location = ("redirect.php");
                    }
                }, 1000);

        });
    </script>