Google Maps v3, polyline mouse events

Is it possible to detec开发者_JS百科t when the mouse has entered and exited a polyline region in Google Maps v3?

As a particular use-case, I would like to change the color of a polyline when then mouse is hovering over it. Polylines allow registration of a "mousemove" event, but it doesn't seem to allow notification of mouse over/out events. This strikes me as a pretty basic bit of utility. Are there any solutions for doing this sort of thing? Is this an inappropriate use of polylines?

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The Google Maps team has added a mouseover event for polylines as of Apr 26, 2010 (Google Maps Javascript API V3).