function IESafeOffsetParent(elem) {
    try {
        return elem.offsetParent;
    }
    catch (e) {
        return document.body;
    }
}

// The Offset Method
// Originally By Brandon Aaron, part of the Dimension Plugin
// http://jquery.com/plugins/project/dimensions
jQuery.fn.offset = function() {
    ///     <summary>
    ///             Gets the current offset of the first matched element relative to the viewport.
    ///     </summary>
    ///     <returns type="Object">An object with two Integer properties, 'top' and 'left'.</returns>

    var left = 0, top = 0, elem = this[0], results;

    if (elem) with (jQuery.browser) {
        var parent = elem.parentNode,
                offsetChild = elem,
                offsetParent = IESafeOffsetParent(elem),
                doc = elem.ownerDocument,
                safari2 = safari && parseInt(version) < 522 && !/adobeair/i.test(userAgent),
                css = jQuery.curCSS,
                fixed = css(elem, "position") == "fixed";

        // Use getBoundingClientRect if available
        if (false && elem.getBoundingClientRect) {
            var box = elem.getBoundingClientRect();

            // Add the document scroll offsets
            add(box.left + Math.max(doc.documentElement.scrollLeft, doc.body.scrollLeft),
                        box.top + Math.max(doc.documentElement.scrollTop, doc.body.scrollTop));

            // IE adds the HTML element's border, by default it is medium which is 2px
            // IE 6 and 7 quirks mode the border width is overwritable by the following css html { border: 0; }
            // IE 7 standards mode, the border is always 2px
            // This border/offset is typically represented by the clientLeft and clientTop properties
            // However, in IE6 and 7 quirks mode the clientLeft and clientTop properties are not updated when overwriting it via CSS
            // Therefore this method will be off by 2px in IE while in quirksmode
            add(-doc.documentElement.clientLeft, -doc.documentElement.clientTop);

            // Otherwise loop through the offsetParents and parentNodes
        } else {

            // Initial element offsets
            add(elem.offsetLeft, elem.offsetTop);

            // Get parent offsets
            while (offsetParent) {
                // Add offsetParent offsets
                add(offsetParent.offsetLeft, offsetParent.offsetTop);

                // Mozilla and Safari > 2 does not include the border on offset parents
                // However Mozilla adds the border for table or table cells
                if (mozilla && !/^t(able|d|h)$/i.test(offsetParent.tagName) || safari && !safari2)
                    border(offsetParent);

                // Add the document scroll offsets if position is fixed on any offsetParent
                if (!fixed && css(offsetParent, "position") == "fixed")
                    fixed = true;

                // Set offsetChild to previous offsetParent unless it is the body element
                offsetChild = /^body$/i.test(offsetParent.tagName) ? offsetChild : offsetParent;
                // Get next offsetParent
                offsetParent = offsetParent.offsetParent;
            }

            // Get parent scroll offsets
            while (parent && parent.tagName && !/^body|html$/i.test(parent.tagName)) {
                // Remove parent scroll UNLESS that parent is inline or a table to work around Opera inline/table scrollLeft/Top bug
                if (!/^inline|table.*$/i.test(css(parent, "display")))
                // Subtract parent scroll offsets
                    add(-parent.scrollLeft, -parent.scrollTop);

                // Mozilla does not add the border for a parent that has overflow != visible
                if (mozilla && css(parent, "overflow") != "visible")
                    border(parent);

                // Get next parent
                parent = parent.parentNode;
            }

            // Safari <= 2 doubles body offsets with a fixed position element/offsetParent or absolutely positioned offsetChild
            // Mozilla doubles body offsets with a non-absolutely positioned offsetChild
            if ((safari2 && (fixed || css(offsetChild, "position") == "absolute")) ||
                        (mozilla && css(offsetChild, "position") != "absolute"))
                add(-doc.body.offsetLeft, -doc.body.offsetTop);

            // Add the document scroll offsets if position is fixed
            if (fixed)
                add(Math.max(doc.documentElement.scrollLeft, doc.body.scrollLeft),
                                Math.max(doc.documentElement.scrollTop, doc.body.scrollTop));
        }

        // Return an object with top and left properties
        results = { top: top, left: left };
    }

    function border(elem) {
        ///     <summary>
        ///             This method is internal.
        ///     </summary>
        ///     <private />
        add(jQuery.curCSS(elem, "borderLeftWidth", true), jQuery.curCSS(elem, "borderTopWidth", true));
    }

    function add(l, t) {
        ///     <summary>
        ///             This method is internal.
        ///     </summary>
        ///     <private />
        left += parseInt(l, 10) || 0;
        top += parseInt(t, 10) || 0;
    }

    return results;
};