Need some good idea about web app

[S. Baseyko]

Hi for all.

I need your advice in following:

I've web app implemented in apache + php + mysql, that parsing some data
from client's browser and displaying analysis of this data to user. There is
limited count of forms to input data.

Now I want more complex solution:

1. Opportunity to create (by user via browser) the forms for data input and
view of these forms respectively;

2. Management of these created forms on server side (modification, deleting,
etc.);

3. Presentation of these forms for other users and saving they results in
database for later analysis.

To do this, I want move the part of functionality (like checking for errors,
when user creates form and when he inputs data, etc) on client side to
reduce traffic between server and client. Also I want this app to be
independent from client's platform and browser and nice looking for user.

To archive these I can (as I see):

1. Use Flash for client side

+ nice looking

- I heard it cooperation with html not so good (maybe I wrong)

2. Use JavaScript

+ nice cooperation with html

- problems with JS implementation on different platforms and
browsers.

I've experience in developing app on different languages, but in Java I'm
new. So I ask your opinion in following:

1. Should I use listed technologies or I can use only Java to archive all I
want in best way?

2. And, if I can use Java for these, what exactly technologies I've to use
and the best docs or books to read?

I'll be appreciating for any help!

Best regards.