function fcheckfields(tform) {
  if((tform.fullname.value == "") && (tform.company.value == "")) { 
    var msg = "Please enter your name.";
    window.alert(msg);
    tform.fullname.focus();
    return false;
  } else if(tform.email.value.indexOf("@") < 0) { 
    var msg = "Please enter your e-mail address.";
    window.alert(msg);
    tform.email.focus();
    return false;
  } else if(tform.telephone.value == "") { 
    var msg = "Please enter your telephone number.";
    window.alert(msg);
    tform.telephone.focus();
    return false;
  } else if(!(tform.acceptterms[0].checked)) { 
    var msg = "Please accept our terms by clicking 'yes'.";
    window.alert(msg);
    return false;
  } else {
    return true;
  }
}