You need use "resolutions" property while configuring your map. For example:

var resols =  [8000, 7766.99029, 7540.76727, 7321.13327, 7107.89638,
6900.87027,...]
map = new OpenLayers.Map({
                div: "map-id",
                maxExtent:  new
OpenLayers.Bounds(13909282.60,4024860.68,21806397.50,10422101.44),
                units: 'm',
                resolutions: resols,
                ...      
http://trac.osgeo.org/openlayers/wiki/SettingZoomLevels
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