(function($){
    $.fn.nederenameCountDown = function(timestamp) {
        
        var now = 0;
        var diff;
        var seconds;
        var minutes;
        var hours;
        var days;
        var DOMobject = this;
        
        calc = function() {
            now = Math.round(+new Date()/1000);
            diff = timestamp - now;

            seconds = Math.floor(diff % 60);
                diff = diff/60;
            minutes = Math.floor(diff % 60);
                diff = diff/60;
            hours = Math.floor(diff % 24);
                diff  = diff/24;
            days = Math.floor(diff);
            
            DOMobject.text('Nog '+days+' dagen, '+hours+' uur, '+minutes+' min, '+seconds+' sec');
        }
        
        setInterval(calc, 50);
        
    };
})(jQuery);