good morning :o) I solved the problem: - IE6 is deleting every single option if you use XXX.html(''); or the jq-plugin with .removeOption(/./); and stops the browser for this time - all other(including IE7+IE8) are handling this in background process.
Result: I used the beforeSend methode to clean those options, as a result the box stayed open until those boxes are empty. On inserting this cleaning in the success function this error disappeared. --> Solved :o) Thanks a lot for trying... greeting, mathew