Drupal install jquery1.4.2

After some long reading in several issues on drupal.org. Here is the solution:

Install http://drupal.org/project/jquery_update (install the 6.x-2.0-alpha1)
Patch it with this patch http://drupal.org/node/685060#comment-3560788

Now you need a core patch otherwise some the views ajax and some other jquery will stop working. The core patch is here:
http://drupal.org/node/479368#comment-3198886