title: How to stop a form submitting if multiple regular expressions are not matched
body: <p>I want to submit a form that checks two regular expressions.
  However, when i use:</p>
  
  <pre><code>&lt;input id = "submit" type="submit" value="Submit" onclick="return validateCode(postalCode); return validateCard(cardNumber)" /&gt;
  </code></pre>
  
  <p>I only seem to be able to check agains the postal code (and then return to the page), it wont check the card number at all?</p>