Wasn't it William who wrote:
>Google Maps API sets the CSS Z-Index for each overlay according to the
>latitude.  According to the doco "it computes a z index such that
>overlays further south are on top of overlays further north, thus
>creating the 3D appearance of marker overlays."

That's only true for GMarkers where the display would look odd if the 
markers overlaid each other in the other order.

>Testing in FireFox 3, it appears like some of the map tiles have a
>higher z-index than the polylines, so they hide the polylines.  This
>is more likely to happen in the north because polylines in the north
>have lower z-indices.  Sometimes you can see the end of a very long
>vertical polyline, with the rest of it covered by a maptile.

Polylines live in a pane that that floats above the tile pane.
Everything on the polyline pane, G_MAP_OVERLAY_LAYER_PANE, is displayed 
above everything in the unnamed pane where the map tiles live.

-- 
http://econym.org.uk/gmap
The Blackpool Community Church Javascript Team


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