.emacs setup question

[Lance Hoffmeyer]

I am trying to get emacs to open dvi2tty in console and tkdvi in X.  The syntax 
I saw was:

(setq tex-dvi-view-command
          (if (eq window-system 'x) "tkdvi" "dvi2tty * "))
 
but this does not seem to work.  How do I modify this so that different viewer 
will be used depening on whether
I am using a console on Xwindows?

Lance