function ScrollHolder() {
    //add event to window
    this.addWindowListener = function(sEventType, fnHandler) {
        if (window.addEventListener) {
            window.addEventListener(sEventType, fnHandler, false);
        } else if (window.attachEvent) {
            window.attachEvent("on" + sEventType, fnHandler);
        } else {
            window["on" + sEventType] = fnHandler;
        }
    }

    //remember scrolling information when window is unloading
    this.whenUnload = function() {
        var scrollTop = document.documentElement.scrollTop;
        document.cookie = "scrollTop=" + scrollTop;
    }

    //set current scroll bar the last page scroll bar position
    this.whenLoad = function() {
        var scrollTop = document.cookie.match(new RegExp("(^| )scrollTop=([^;]*)(;|$)"));
        if (scrollTop == null)
            scrollTop = 0;
        window.scrollTo(0, scrollTop[2]);
    }

    //run this script
    this.run = function() {
        this.addWindowListener("unload", this.whenUnload);
        this.addWindowListener("load", this.whenLoad);
    }
}

var scrollHolder = new ScrollHolder();
scrollHolder.run();