[Feran]

This is how I do it:

PHP Code:

$alt_on=0;

while (outputting_threads_or_posts) {
  if (!$alt_on) {
    show_first_color;
    $alt_on = 1;
  }
  else {
    show_second_color;
    $alt_on = 0;
  }
} 


Um, unless vBulletin catches the entire threads' posts' template at once and spits it out, catch it before it outputs each individual post, and alter.