In my web application, in the login page, I have a checkbox. After entering the username/password, if the user doesn't tick the checkbox (T&C), he should not be taken to the home page, and an alert error message will be shown.

I have tried the following code. But it is not working. That is, an alert message is shown. But the user is taken to the next page(home page). I tried returning false, but no luck.

Can anyone tell how to fix this?

function doSubmit() {

    var checkbox = document.getElementById(terms);

    if (!checkbox.checked) {

        alert(error message here!);

        return;

    }

    document.getElementById(f).submit();

}​  

I am calling doSubmit from

<input id=proceed onclick=doSubmit() type=submit value=${fn:escapeXml(submit_label)} />