how to write java script validate function

Hi:

Currently I am working on an customer order form. The email address should be entered when the user submits. So I need add something like "input type=submit value=submit onclick="validate()"  " right? My question is how to write the validate() so that the user won't submit?
ly_uwoAsked:
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boonlengConnect With a Mentor Commented:
You need to return true or false in the javascript function.

Example:
<script>
function validate() {
    if (no error) {
        return true;
    } else {
        return false;
    }
}
</script>

<form onsubmit="return validate()">

Note: is best perform validation on onSubmit instead of onclick on the button. This is to cater for user press 'Enter' key.
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