[OpenLayers-Users] Changing Filter on a mapserver Layer

[Stephen Woodbridge]

Hi all,

I have a POI overlay layer, based on a mapserver layer.
I would like to create a multiple select dropdown list of the POI 
classes, that the user can select. Then on change I would like to change 
the mapserver url to include the selected items and refresh the layer.

So for example, the user selects HOTEL, DINING, BANK

then the mapserver URL would need to include

POI=HOTEL,DINING,BANK

I can handle the js for the onChange, but I'm not sure how to change the 
mapserver layer object, or how to trigger the layer to be redrawn.

Some help would be appreciated.

Thanks,
   -Steve