window.onscroll = function () {

    if (window.XMLHttpRequest) {



        if ($("#container.csBookmarks").is("div")) {
            if (document.documentElement.scrollTop > 301 || self.pageYOffset > 301) {
                var thisScrollTop = document.documentElement.scrollTop;
                var topDiff = document.documentElement.scrollTop - 301;
                if (topDiff < 112) {
                    $('#bkPrevDetails').css('top', topDiff);
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                else {
                    $('#bkPrevDetails').css('top', 112);
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            } else if (document.documentElement.scrollTop < 301 || self.pageYOffset < 301) {
                $('#bkPrevDetails').css('position', 'absolute');
                $('#bkPrevDetails').css('top', '0px');
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        }
        else if ($("#container.csacknowledgement").is("div")) {
            if (document.documentElement.scrollTop > 301 || self.pageYOffset > 301) {
                var thisScrollTop = document.documentElement.scrollTop;
                var topDiff = document.documentElement.scrollTop - 301;
                if (topDiff < 546) {
                    $('#bkPrevDetails').css('top', topDiff);
                }
                else {
                    $('#bkPrevDetails').css('top', 546);
                }
            } else if (document.documentElement.scrollTop < 301 || self.pageYOffset < 301) {
                $('#bkPrevDetails').css('position', 'absolute');
                $('#bkPrevDetails').css('top', '0px');
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        }

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                var thisScrollTop = document.documentElement.scrollTop;

                var topDiff = document.documentElement.scrollTop - 301;
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                    $('#bkPrevDetails').css('top', topDiff);
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                else {
                    $('#bkPrevDetails').css('top', 560);
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                    if (topDiff < 440) {
                        $('#bkPrevDetails2').css('top', topDiff);
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                    else {
                        $('#bkPrevDetails2').css('top', 440);
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                $('#bkPrevDetails').css('position', 'absolute');
                $('#bkPrevDetails').css('top', '0px');
                $('#bkPrevDetails2').css('position', 'absolute');
                $('#bkPrevDetails2').css('top', '0px');
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    }
}