problems with hook_form_alter()
A better approach is to edit the content type settings and omit body altogether.

In Drupal 6, you can do this by going to /admin/content/types/ipaper and leave the "Body field label" empty.

In Drupal 7, go to /#overlay=admin/structure/types/manage/ipaper/fields and delete the Body field.

If you really need to keep old content in the node body, then use hook_nodeapi() with $op == 'view to unset $node-&gt;body