[X-Unix] Cron problem

[Marley Graham]

This probably something I'm not understanding about how cron works. I  
use the following command to capture screen shots:

screencapture /mgscreen$( date +%R )

and it returns a file like:

                 mgscreen13:48

Now I would like to schedule that for every half-hour, so I put the  
following entry in crontab:

0,30 7-16 * * 1-6 screencapture /mgscreen$( date +%R )

and I get the following error reported through Unix mail:

Subject: Cron <marleygraham at Marley-Grahams-Computer> screencapture / 
mgscreen$( d
X-Cron-Env: <SHELL=/bin/sh>
X-Cron-Env: <PATH=/usr/bin:/bin>
X-Cron-Env: <LOGNAME=marleygraham>
X-Cron-Env: <USER=marleygraham>
X-Cron-Env: <HOME=/Users/marleygraham>
Date: Wed, 22 Jun 2005 13:00:00 -0700 (PDT)

/bin/sh: -c: line 1: unexpected EOF while looking for matching `)'
/bin/sh: -c: line 2: syntax error: unexpected end of file

Can someone tell me why cron doesn't like the syntax when it works OK  
on the command line?

Marley Graham
Aqua-Flo Supply
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