jQuery.fn.center = function () {
    this.css("position","absolute");
    this.css("top", ( $(window).height() - this.height() ) / 2+$(window).scrollTop() + "px");
    this.css("left", ( $(window).width() - this.width() ) / 2+$(window).scrollLeft() + "px");
    return this;
}

$(document).ready(function(){
   $("#wrapper").center();
   
   $('.panel').hover(
       function () {
         $(this).find('#nextBtn, #prevBtn').toggle();
       },
       function () {
         $(this).find('#nextBtn, #prevBtn').toggle();
       }
     );
   
   $("#slider").easySlider({ 
   	 auto: false,
   	 numeric: false,
   	 continuous: true
   });
 });