client side validation using jquery

[eluser]padma6[/eluser]
I am new to codeigniter framework and jquery also.

I am trying to do client side validations using jquery and downloaded jquery.js and jquery.validate.js.

I have worked on example outside the codeigniter framework it is working fine. But if i placed inside framework then while submitting the form, error messages are displaying and fine till now.But again if i click on submit then error messages are appending to previous errors.

Suppose, please enter username.
again clicking on submit
please enter username.please enter username.

Please someone suggest the solution. Thanks in advance.