Okay, I will try to explain the problem more clearly.
I've developed a client server application with struts.
The user is able to delete and to add catchwords into the tree. Everytime when this happens a message is sent to the server which sends a new jsonString back to the client. The client deletes the old tree and creates a new tree with the new json string.
With Firefox there is no problem!
The problem appears with the Internet Explorer, everytime when I add or when I delete a catchword. He does not reload the tree. There is still the old tree on the website which has been loaded the first time.
Does anybody has an idea?