function hstbck() {
  history.back();
}

function hstfwd() {
  history.forward();
}

function updloc() {
  location.reload();
}

function updopw() {
  window.opener.location.reload();
}

function clswin() {
  window.close();
}

function opnwin(urltgt,numhgt) {
  window.open(urltgt,null,'width=500,height='+numhgt+',menubar=no,location=no,toolbar=no,status=no,resizable=yes,scrollbars=yes');
}