function checkForm(theForm) {
  var formOK = true;
  var numElements = theForm.elements.length;

  for(i=0; i<numElements; i++) {
    if(theForm.elements[i].className.indexOf('required') >= 0 && theForm.elements[i].value == '') {
      formOK = false;
    }
  }

  if(theForm.noEmail && theForm.noEmail.checked == false) {
    if(theForm.email.value == '') {
      formOK = false;
    }
  }

  if(theForm.readterms && theForm.readterms.checked == false) {
    alert('You must verify that you have read the Seller\'s Limited Warranty');
    return false;
  }

  if(!formOK) {
    alert('All required fields must be filled out and formatted correctly');
  }

  return formOK;
}