Hello to everybody!
It's the first time that i write in this forum, but i have discover a thing working with jquery and now i have a problem...

I create a simple web page to test the problem that i found in local, and give the same problem!
In this page i put on a little form, with an input text and a hidden field. Then, the action call a AJAX function create with jQuery that serialize the form and send the data to another page that read the data and print it.

In my idea, the page should send always the same hidden data, but with firebug i can change it!

So, now i have some doubt: if is possible to change hidden data, a cracker could even change the id of a user write in an hidden file, and so change the user of a UPDATE sql, or change a max_range value and so on!

What about security? What can i do to make sure that my data is the one that i want?

Thanks for all the help that you can give me!

Giovanni