export as dxf in blender 2.5 ???

is there any possibility to export as dxf or dwg (autocad extensions) from Blender 2.5 ???
please help!

Not yet. It is from 2.4x and I hope they make it possible for 2.5x as well. Meanwhile you can use FBX or even 3DS.

This thread might help: http://blenderartists.org/forum/showthread.php?t=189354