function checkLegal(checkbox) {
  if (checkbox.checked) {
    checkbox.form.submit.disabled = false;
  }
  else {
    checkbox.form.submit.disabled = true;  
  }
}

function popWindow(href, target, attributes) {
  if (attributes == null) {
    attributes = "width=875,height=600,resizable=yes,scrollbars=yes,menubar=yes";
  }
  popWin = window.open(href, target, attributes);
  popWin.focus();
  return false;
}