Animate objects visualisation

hi
is it posible to set a start and stop frame of and objects visualisation.
of animate that in some way

thanks

In blender 2.5 just keyframe an objects visibility/renderability from the outliner window.
You can also keyframe an object moving from one layer to another. One of those layers can be set to not be visible and/or not rendered

oke i’m working with blender 2.49 so i’m try the animating a layer