Get Position of Mouse Cursor on Mouseover of Google Maps V3 API Marker

I am trying to make a div visible at the position of the cursor when the cursor mouseover a marker using jQuery. Its kind of like a tooltip. However I cannot seem to figure out how to get the X/Y coordinates of the point below the cursor.

Current Code:

google.maps.event.addListener(marker, "mouseover", function(event) {

    $("#tooltip").css({
        position: "absolute",
        top: event.pageY,
        left: event.pageX
    }).toggle();

I believe event does not have the properties pageY and pageX like in the event in jQuery.

How do I get the position of the mouse cursor?