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function GetScrollY()
{       
    if (typeof window.pageYOffset == 'number')
    {
        return window.pageYOffset;
    }
    var CompatMode = window.document.compatMode;
    var DocumentElement = window.document.documentElement;
   
if ((typeof CompatMode == 'string') &&
(CompatMode.indexOf('CSS') >= 0) &&
(DocumentElement) && (typeof
DocumentElement.getAttribute("scrollTop") ==
'number'))
    {
        return DocumentElement.getAttribute("scrollTop");
     }
    var Body = window.document.body ;
    if ((Body) && (typeof Body.getAttribute("scrollTop") == 'number'))
    {
        return Body.getAttribute("scrollTop");
    }
    return 0;
}
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