在某个点上弹出层

 <script type="text/javascript">

        function showUserInfo(obj) {
            var authort;
            var point = absolutePoint(obj);
            var div = document.getElementById('divshow');
            div.style.position = 'absolute';
            div.style.left = point.x + 127 + "px";
            div.style.top = point.y + "px";
            div.style.display = 'block';

            authort = setTimeout("document.getElementById('divshow').style.display = 'block';", 100);
            if (!div.onmouseover) {
                div.onmouseover = function() {
                div.style.display = 'block';
                }
                div.onmouseout = function() {
                div.style.display = 'none';
                }
            }
            if (!obj.onmouseout) {
                obj.onmouseout = function() {
                    clearTimeout(authort);
                }
            }
        }

        function closeCard() {
            var div = document.getElementById('divshow');
            div.style.display = 'none';
        }


        /// <summary>
        /// 获得元素的绝对坐标
        /// </summary>
        /// <param name="element">HTML元素</param>
        function absolutePoint(element) {
            var result = { x: element.offsetLeft, y: element.offsetTop };
            element = element.offsetParent;
            while (element) {
                result.x += element.offsetLeft;
                result.y += element.offsetTop;
                element = element.offsetParent;
            }
            return result;
        }
    </script>