transparent surface with GL

[hoberoi at eagle.wesleyan.edu]

hi,

	I was wondering if anyone had written a routine for doing transparent
surfaces using GL on the RS6000 ?. This machine comes without an alpha plane. 

I remember seeing something on transparent surfaces sometime back...

any pointers ?.
 
(my system is an RS6000 530, 24 bit 3D graphics adapter with z-buffer)

thanks 

himanshu