get height from jq source

if ( jQuery.isWindow( elem ) ) {
            // Everyone else use document.documentElement or document.body depending on Quirks vs Standards mode
            // 3rd condition allows Nokia support, as it supports the docElem prop but not CSS1Compat
            var docElemProp = elem.document.documentElement[ "client" + name ],
                body = elem.document.body;
            return elem.document.compatMode === "CSS1Compat" && docElemProp ||
                body && body[ "client" + name ] || docElemProp;

        // Get document width or height
        } else if ( elem.nodeType === 9 ) {
            // Either scroll[Width/Height] or offset[Width/Height], whichever is greater
            return Math.max(
                elem.documentElement["client" + name],
                elem.body["scroll" + name], elem.documentElement["scroll" + name],
                elem.body["offset" + name], elem.documentElement["offset" + name]
            );