Sorry, i can't post to the developer forum, so i post it here.
till - i actually have no time to help you coding - sorry!
"but" i am willing to help you with some "hints".
i am joining several days the qooydoo comunity (www.qooxdoo.org)
this is a very good gui - framework.
1) @till have a look at it
2) (also @till) think about firewalls and ajax. for example i have hade some code, calling the server several times (for example 3 time in 2 seconds). now the firewall at norton "thinks" this is an atack (because one IP tryes to send you data 3 times in 2 seconds). The result is, that norton BLOCKS the server for 30 minutes! (this is the reason, why i dropped working to much with ajax).
an other problem ist the using of the httpxml transport in IE and FF. if you are NOT using iframes to post data, some or the virus-scanner thinks, your programm is a virus and blocks it!
if you like to know more - send me a mail!