Layer display order (z-index)?

[Jackey Cheung]

Greetings!

I've put some roads, polygons and poi to my map, their order in the map file is: polygon layers go first, then road layers, and the poi layer is the last. A picture is generated like this: http://www3.mapasia.com/jackout/mapserv.png

As you can see, those 2 POI icons are covered by roads, can I make those POI icons always on top of everything else in the map?

I've tried re-ordering layers in the map file, but the icons are kept covered by roads.
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