(function($){
            $.fn.changeBackGround = function(gameCode){
                var divMain = $('#div_main');
                var banner = $('#img_gamePic');
                if(gameCode == '013'){
                    changeBackgroundImg(divMain, 'class', 'main_wowus');
                    changeBackgroundImg(banner, 'src', '/images/wowuspro_banner.jpg');
                }else if(gameCode == '019'){
                    changeBackgroundImg(divMain, 'class', 'main_woweu');
                    changeBackgroundImg(banner, 'src', '/images/woweupro_banner.jpg');
                }else if(gameCode == '003'){
                    changeBackgroundImg(divMain, 'class', 'main_ffxi');
                    changeBackgroundImg(banner, 'src', '/images/ffxi_banner.jpg');
                }else if(gameCode == '083' || gameCode == '087'){
                    changeBackgroundImg(divMain, 'class', 'main_aion');
                    changeBackgroundImg(banner, 'src', '/images/aionpro_banner.jpg');
                }else if(gameCode == '003'){
                    changeBackgroundImg(banner, 'src', '/images/eve.jpg');
                }else if(gameCode == '007'){
                    changeBackgroundImg(banner, 'src', '/images/eq2.jpg');
                }else if(gameCode == '005'){
                    changeBackgroundImg(banner, 'src', '/images/l2.jpg');
                }else if(gameCode == '004'){
                    changeBackgroundImg(banner, 'src', '/images/swg.jpg');
                }
            }
            
            changeBackgroundImg = function(dom, className, classValue){
                if($(dom).attr(className) != undefined){
                    $(dom).attr(className, classValue);
                }
            }
        })(jQuery)