transparency slider represents opacity

```
Transparency effect slider checged to 30 %

assuming it gives 30 % transparency but it effectively gave me 30 % opacity.


so i think either iverse display or changing transparency to opacity.

or marking completely transparent and no transparency at both ends of slider 
might help.



```

Original issue reported on code.google.com by `ant201...@gmail.com` on 16 Jun 2010 at 5:20
