Need help on how to validate onblur

[chethank]

Hi,
Can you please let me know how to validate a input on blur, my issue is currently when the user clicks on the input box the validation error popup gets displayed saying "This field is required".
Is it possible not show this onclick but show the error onblur, say the user moves on to next field then only I need to show the error for the previous input.

Thanks
Chethan K