function openwindow(url, name, params) {
  win = window.open(url, name, params);
  win.focus();
  return false;
}

var mopen = false;
var mname = '';
function navigation(name) {
//  return false;
  if (name) {
    if (document.getElementById('navigation'))
      document.getElementById('navigation').style.visibility='hidden';
    if (document.getElementById('navigation_'+mname))
      document.getElementById('navigation_'+mname).style.visibility='hidden';
    if (document.getElementById('navigation_'+name))
      document.getElementById('navigation_'+name).style.visibility='visible';
    mname = name;
  }
  else if (mname) {
    if (document.getElementById('navigation'))
      document.getElementById('navigation').style.visibility='visible';
    if (document.getElementById('navigation_'+mname))
      document.getElementById('navigation_'+mname).style.visibility='hidden';
    mname = '';
  }
  else {
    if (document.getElementById('navigation'))
      document.getElementById('navigation').style.visibility='visible';
  }
  return false;
}