Here it is.  Any improvements?

#declare slidetext1=
        texture{ pigment{image_map {png "mimeslide020593.png" map_type 0
once }}finish{ambient .4 diffuse 0}}
        texture{pigment{rgbf <1,1,1,1>}}

#declare slidetext2=
        texture{ pigment{image_map {png "mimeslide020593.png" map_type 0
once }}finish{ambient <1,3,1> diffuse 0}}
        texture{pigment{rgbf <1,1,1,1>}}

    box{<0,0,-0.0001>,<1,1,-0.0002>
        texture{
                gradient y
                texture_map{
                        [0.25 slidetext1]// finish{ambient rgb<1,1.5,1>}]//
pigment{rgbf <1,1.0,1,0.95> } ]
                        [0.25 slidetext2]// finish{ambient rgb
100}]//<1,0.5,1>}]// pigment{rgbf <1,1.0,1,0.95> } ]
                        //[0.25 pigment{rgbf <1,26.0,0,0.95>}]
                        }
                        frequency 50                        }
        scale 400
        translate 600*z}

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