Making a commandButton's action dependant on a javascript function's result

Hi guys,
I have a command button "Login". I have a managed bean "userLoginInfoBean" with session scope whose "loginToSystem" method I want to call when user clicks on Login button.
<h:commandButton id="loginButton" type="submit" value="Login" style="font-family: Verdana; font-size: 8pt" action="#{userLoginInfoBean.loginToSystem}">So far so good. Its working perfect.
Now before calling the action, I want to call a javascript function isGoAhead(). This javascript function will return true or false. Only when it returns true then I want to call the action.
How can I do it in JSF?
Thanks

I know using onclick attribute I can call my javascript function "isGoAhead()"
<h:commandButton id="loginButton" type="submit" value="Login" style="font-family: Verdana; font-size: 8pt" onclick="isGoAhead();" action="#{userLoginInfoBean.loginToSystem}">But the question is how to make sure that the commandButton's action only gets called if the return value from "isGoAhead()" is true?
Thanks

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Making a commandButton's action dependant on a javascript function's result

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