[OpenLayers-Users] WMS Change Layers depending on ZoomLevel

[Diego Guidi]

> I want to display topp:layer1 and topp:layer2. When i zoom in two levels I
> want to display topp:layer1, topp:layer2 and topp:layer3 ...................

You must manage manually the layers property when the scale changes.
You could use mergeNewParams to change the layers list.