Glass - Please Help!

Hello!

I´m trying to make a white glass (frosted glass), but it just don´t come
out right. For what I´ve read in this forum, I have to play with refract and
glossiness, but as soon as I change the value to less than 1 it will become
very dark and non transparent!

I would like to archive something like the one in the following post, but would be very happy with something similar to white glass:

http://www.chaoticdimension.com/forums/phpBB2/viewtopic.php?t=4257

I`m also having trouble rendering scenes with reflections, i´ve tried scenes from another users of this forum, with render times of 1 minute, and in my computer goes to 20 min., it just takes too long with reflections. Maybe is some configuration of some type.

My Pc is P4 2000 with 1GB DDR333

Thanks for your help in advance,

Guilherme

I just updated my post, you can find the settings there, enjoy

Thanks, I´ve seen them, but I don´t know why my material is completly black.
What are your interpolation settings and AA?

Guilherme