form validation

Hello:

I want to validate e-mail field in my form in such a way that if some one eters an email address ending with @hotmail.com or @yahoo.com then on submiting the form it gives error message.
Is there any extension available? please help me.

Thanks in advance
classna

Check out this site, just see how they did it, learn from it, work it into your site.

http://developer.netscape.com/docs/examples/javascript/formval/overview.html

Goodluck!

Robert Jansen