if ( event.pageX == null && event.clientX != null ) {
            var doc = document.documentElement, body = document.body;
            event.pageX = event.clientX + (doc && doc.scrollLeft || body && body.scrollLeft || 0) - (doc.clientLeft || 0);
            event.pageY = event.clientY + (doc && doc.scrollTop || body && body.scrollTop || 0) - (doc.clientTop || 0);
        }