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database connection through js

I want some basic example of ajax in which dabase connection is used.I have serched I don't understand and not get.

I have used php,mysql

I have try for simple registration form in which 2 text field. one is username and 2 is password
When i enter the username it has to check that in database this user is exist or not without page submitting if php script is called.

Please tell me how i can know that from html in which js is included that this username is exist or not and if exist message will display.
Please reply me
Nov 18 '06 #1
1 1991
vssp
268 100+
I think no need to using ajax just using header function to pass the values another page and validate then return immediatly home hage.

No need to using ajax

vssp
Nov 18 '06 #2

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