I set Rules to Ortho-photo layer as 
                          <MinScaleDenominator>1</MinScaleDenominator>
                          <MaxScaleDenominator>10000</MaxScaleDenominator>
so that the ortho will show as scale > 1:10000, but based on my testig, it
will show as scale > 1:8000, this happened for mapBuilder 1.5 rc1 and the
newest trunk version which support Fractional Zoom.

Here is the XML for the Ortho layer in the map content document.

<Layer queryable="0" hidden="1">
          <Server service="OGC:WMS" version="1.1.1" title="Local">
            <OnlineResource xlink:type="simple"
xlink:href="http://GISwebservices.massgis.state.ma.us/geoserver/wms"; /> 
          </Server>
          <Name>massgis:GISDATA.IMG_COQ2005</Name> 
          <Title>Orthophoto Image</Title> 
          <SRS>EPSG:26986</SRS> 
          <FormatList>
            <Format current="1">image/gif</Format> 
          </FormatList>
          <StyleList>
            <Style current="1">
              <SLD>
                <StyledLayerDescriptor version="1.0.0">
                  <NamedLayer>
                    <Name>massgis:GISDATA.IMG_COQ2005</Name>
                    <UserStyle>
                      <FeatureTypeStyle>
                        <Rule>
                          <MinScaleDenominator>1</MinScaleDenominator>
                          <MaxScaleDenominator>10000</MaxScaleDenominator>
                          <RasterSymbolizer>
                            <Opacity>1.0</Opacity>
                            <ChannelSelection>
                              <RedChannel>
                                <SourceChannelName>1</SourceChannelName>
                              </RedChannel>
                              <GreenChannel>
                                <SourceChannelName>2</SourceChannelName>
                              </GreenChannel>
                              <BlueChannel>
                                <SourceChannelName>3</SourceChannelName>
                              </BlueChannel>
                            </ChannelSelection>
                            <OverlapBehavior>
                              <LATEST_ON_TOP />
                            </OverlapBehavior>
                            <ContrastEnhancement>
                              <GammaValue>1.0</GammaValue>
                            </ContrastEnhancement>
                          </RasterSymbolizer>
                        </Rule>
                      </FeatureTypeStyle>
                    </UserStyle>
                  </NamedLayer>
                </StyledLayerDescriptor>
              </SLD>
            </Style>
          </StyleList>
        </Layer>
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