[pstricks] \defineTColor

[Mr. Question]

How can I apply the transparency trick to lines?

For example,

\defineTColor{TWhite}{white}
\psline[linewidth=.3,linestyle=TWhite](0,0)(5,5)
\pscircle[linewidth=.1,linestyle=TWhite,fillstyle=none](2,2){1}

I am trying to create a circle that is not filled at all, but it should 
have a transparent border.

Perhaps there is a better way to do this.

Thanks.