// validate the subscribe email form
function validate_subscribe ()
  {
    var bError;
    var objForm;
    objForm = document.forms["form_subscribe"];
    bError = false;
    getElement ("error_email").style.visibility = "hidden";
    if (!(new RegExp (/^[^@\s<&>]+@([-a-z0-9]+\.)+[a-z]{2,}$/i)).test (objForm.elements["email"].value))
      {
        getElement ("error_email").style.visibility = "visible";
        bError = true;
      }
    if (!bError)
      {
        objForm.submit ();
      }
  }