Movement Up / Down

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Merrie

How would I make the code for the camera to go up & down on the Y line? Here is what I have and it is not working. Im using the Page Up/Page Down buttons. It is the last two lines of the function for moveentity.
Thanks!

Function object_key_control( obj )
If KeyDown( 200 )=True Then MoveEntity obj,0,0,1
If KeyDown( 208 )=True Then MoveEntity obj,0,0,-1
If KeyDown( 203 )=True Then TurnEntity obj,0,2,0
If KeyDown( 205 )=True Then TurnEntity obj,0,-2,0
If KeyDown( 201 )=True Then MoveEntity obj,0,1,0
If KeyDown( 209 )=True Then MoveEntity obj,0,-1,0
ex#=EntityX(obj):ez#=EntityZ(obj)
PositionEntity obj,ex,TerrainY( land,ex,0,ez )+5,ez
End Function