/*
 * Website Name: Yanuk.jp
 * Website URI: http://www.yanuk.jp/
 * Description: Yanuk.jp Top Page Resizable Full Background
 * Author: INVISIGN
 * Author URI: http://invisign.com/
 * Date Created: 2011/09/17
 */

$(window).load(function() {    

        var theWindow        = $(window),
            $bg              = $("#bg"),
            aspectRatio      = $bg.width() / $bg.height();

        function resizeBg() {

                if ( (theWindow.width() / theWindow.height()) < aspectRatio ) {
                    $bg
                        .removeClass()
                        .addClass('bgheight');
                } else {
                    $bg
                        .removeClass()
                        .addClass('bgwidth');
                }

        }

        theWindow.resize(function() {
                resizeBg();
        }).trigger("resize");

});