Pmw.Blt with Tkinter

[June Kim]

I've downloaded Pmw, and Blt(blt2.4u-for-8.3.exe) for windows. Pmw was
installed on my system quite successfully, as the demo seems working right,
but BLT parts are not working at all. It says that BLT is not installed --
it is installed under the \python20\tcl directory.

How can I notify my system that I've installed BLT?
(I guess I should add some lines indicating the path to some files)