After several tests, I know that it's because of the htmlarea module activated, that I have problems with the freetagging taxonomy for instance on my news content type. When the word doesn't exist on the taxonomy, the auto-completion field of the freetagging gives me strange codes, such as function(a){for (var i=0;i....

My configuration : Drupal 5.3
htmlarea.module,v 1.104 2007/06/05 and Xinha 0.93
and theme : chameleon/marvin

Thank you for your help!!