[OpenLayers-Users] WMS Change Layers depending on ZoomLevel

[Yoyo]

            layer = new OpenLayers.Layer.WMS(
                "Tiled", "http://localhost:8080/geoserver/wms",
                {
                    layers:
'topp:layer1,topp:layer2,topp:layer3,topp:layer4,topp:layer5',
                    format: 'image/png',
                    tiled: 'true',
                },
                {buffer: 0}
            );

How can I change layers based on ZoomLevel?

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 ...................
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