How to call javascript function & action method on clicking jsf  button?

I have one jsf custom button. I am checking client side validations in mail by calling javascript function & also sending mail by calling action method of a bean which will execute at server side for onclick event of that button. Because of this when I click on that button its calling both javascript function and action method. So even though validations failed its sending mail. How can I overcome this problem?? Please help me....

I am asking regarding commanLinks in jsf. I have the following code block in jsf. Even though mailSentMessage('true'); returns false, its calling action="#{emailObjectAction.sendEmail}" method. thats why I got that doubt. try the following code.
<h:commandLink id="mailBtn123Send"      onclick="return mailSentMessage('true');" value="send mail"     action="#{emailObjectAction.sendEmail}">          
</h:commandLink>

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