Unable to download Psychtoolbox on Mac

1
Hi, this is my first time trying to install PTB, and looks like it's not going to be an easy one.

I downloaded Subversion 1.6.12 and and installed accordingly,
downloaded Psychtoolbox.m and tried running it:

EDU>> cd ~/Desktop
EDU>> DownloadPsychtoolbox
??? Error: File: DownloadPsychtoolbox.m Line: 1 Column: 4
Unexpected MATLAB expression.

this is the error message I got.

So I retried with Subversion 1.6.9 (as in the instruction), and tried the same thing:

EDU>> cd ~/Desktop
EDU>> DownloadPsychtoolbox
??? Error: File: DownloadPsychtoolbox.m Line: 1 Column: 4
Unexpected MATLAB expression.

same error message.

I'm using a brand new Mac with SnowLeopard. Not much of a Mac person, so everything is a bit confusing.

Please help out! Thanks!