Struts validation question

[red phoenix <ro...@gmail.com>]

I want to use struts validation,when field is invalidate,my program can
raise information,like follows:
Username is required.
Password is required.
Phone Number is required.

I know it's server-side validation,I want to use client-side validation,so I
put some code in my JSP files:
</html:form>
<html:javascript formName="ValidationForm" cdata="false" />
</body>
When I run this JSP and put some invalidation in fields,I find Javascript
don't work at all,it still raise follows:
Username is required.
Password is required.
Phone Number is required.
My JDK is 1.6,tomcat5.5.17 and struts is 1.2.9,I want to know if struts is
1.2.9 change the method of supporting client-side validation?

Any idea will be appreciated!