Determining LatLng of mouse when polyline mouseover event fires

Is there a simple way to determine LatLng of the mouse pointer from
within a polyline.mouseover event?

I want to display an ELabel that contains some polyline object related
info near the mousepointer when the cursor moves onto the line.

The only thing I've thought of is to use a polyline mouseover event to
fire a map.singlerightclick and use the resulting glatlng. But that
seems like a mighty complicated way to go about things.

Have I missed something simpler and more direct?