load a node content into a lightbox2 (without headers and footer and other blocks) is it possible to load a node (from an id) into a lightbox 2 without having to load all the additional blocks ? just what the node has to display

I want to make some popups on some links to allow some nodes to be shown inside..
no submission will be made in this case (comments are disabled)

another cool thing will be including webforms in a lightbox..
Again no headers..but I believe that that's more complicated because it's form submission... so ajax in required
There are many ways to do this, and this gets asked a lot, please have a look at my answer in this question.

Look at this doc page from the Lightbox2 documentation.

Right now though I highly recommend using the Modal Frame API and Automodal for things like this.

** Drupal 7 update

The colorbox module doesn't offer out of the box support for nodes yet (they are working on a patch for this), but in the meantime you can use this approach. You can also use the Shadowbox module, have a look at this and this issue.