function validate_form(frm)
  {
	var namelabel=document.getElementById('namelabel');
	var emaillabel=document.getElementById('emaillabel');
	var commentlabel=document.getElementById('commentlabel');
	
	namelabel.style.color='black';
	emaillabel.style.color='black';
	commentlabel.style.color='black';
	
	var ok=true;
	
  if (!check_empty(frm.realname.value))
  	{ 
		namelabel.style.color='red';
		ok=false;
		}
  if (!check_email(frm.email.value))
  	{
		emaillabel.style.color='red';
		ok=false;
		}
  if (!check_empty(frm.comments.value))
  	{
		commentlabel.style.color='red';
		ok=false;
		}
	
if (ok==false)
  alert('You have not entered all the required information.\nPlease correct all fields that are marked red.');
	 
return ok;
} 

function check_empty(text) {
  return (text.length > 0); // returns false if empty
}

function check_email(address) {
  if ((address == "")
    || (address.indexOf ('@') == -1)
    || (address.indexOf ('.') == -1))
      return false;
  return true;
}