bbcode does not create valid xhtml

Hi,
There's a problem with the bbcode filter. When we add a floating image for instance, and if we have intelligent paragraph settings on (either the one with bbcode or the one included in drupal), then it puts the floating into a div tag.
So there is a "div" tag inside a "p" tag and it is not xhtml.

Solution is to replace all div tags with span tags. I tested it, it seems it works... Included in this report, the modified .inc file, to check.