How to display $variables in drupal 6 preprocess function? I'm having difficulty trying to figure out what variables are within the scope of my hook_preprocess function.  I even tried to print_r($variables['fields']), but I keep getting this long recursive mess.  Is there a much easier way in drupal 6 to see what values I can use?
Install the Devel module.

Once installed use the function dpm() like this: dpm($variables);

This will give you a nice print out of your variables.