jQueryでシンプルなstickyのプラグイン ref: http://qiita.com/se_ino/items/b7e9839fcfcf7665ceca

file0.js

(function($) {
    'use strict';
    $.fn.stickeyMenu = function(options) {
        var $this = $(this);
        var defaultSetting = {
             startTop : 0 ,
             stopTop : 0 ,
             zIndex : 10
        }
        var settings = $.extend( {},defaultSetting,options);
        var init = function() {
            var $self = $(this);

            $self.css( {
                'position' : 'fixed' ,
                'top' : settings.startTop ,
                'zIndex' : settings.zIndex
            })

            $(window).on('load scroll',function() {
                var _top = settings.startTop - $(this).scrollTop();
                if(settings.stopTop <= _top ) {
                    $self.css( {
                        'top' : settings.startTop - $(this).scrollTop()
                    });
                }
                else {
                    $self.css( {
                        'top' : settings.stopTop
                    });
                }
            })
        };

        this.each(function() {
            init.apply(this);
        });
        return this;
    }
})(jQuery);

$(function() {
    var _startTop = 500; // 初期位置
    $('.gloval_menu_section').stickeyMenu( {
        startTop : _startTop
    });
});