Capture text field event in javascript

[iPhoneDeveloper]

Hi,

I am using UIWebview in my application which point to the JSP on my server.
JSP has text fields ,when i am entering the data in text fields keypad is opening up.
I want to capture the "Done" event of the keypad so that i can move the page to next as soon as "Done" is presses by the user.

Thanks.