Is there another method to validate form fields before SUBMIT (like spry validation)?

I used the dreamweaver spry field validation, but it slowed my form page load really bad. So i was wondering if theres a similar method of validating a form (before submit) the way spry does?

Thanks, I am looking into that now… downloaded the plugin & tutorial, the demo looked good, so hopefully it doesn’t slow the site down like spry did.
thanks!

jQuery validation plugin maybe?