function check_validate_feedback() {
  var error=0, field=""

  if (document.frmFeedback.name.value=="") {
    error=1;
    field=field+"\nName";
  }
  if (document.frmFeedback.email.value=="") {
    error=1;
    field=field+"\nEmail";
  }
  if (document.frmFeedback.opinion.value=="") {
    error=1;
    field=field+"\nOpinion";
  }

	if (error != 1) {
    document.frmFeedback.submit();
	}	else {
		field="The following information has not been entered yet, please re-enter:\n"+field
		alert(field);
	}
}