Hi, if the below is the code (which works - there is more but the below is just an example) to verify a form, with just A to Z, a to z and 0 to 9 text can you please tell me what I'd need to put to make a 'checkbox' required please? else if (!/^[a-z0-9]+$/i.test(form.contactNAME.value)) {alert("Please include your name for contact purposes.");form.contactNAME.select(); }Any help you can give me will be much appreciated, thanks!