validateat="onsubmit" gives problem when files are published on server

Hello

I am trying to validate a textbox using the OnSubmit setting.

<cfinput type="text" required="yes" validateat="onsubmit">

                  the validation of the above text field works properly by throwing me a alert box when there is an error and  when i test on my localhost server.

But when i transfer the mysite to server where i am going to publish this doesnt work.the validation simply skips.But when i change validateat="onserver" it works properly.

Any ideas?

Thanks