function openWindow(url, name, features, width, height, isCenter)
{
 if (window.screen)
 {
  if (isCenter)
  {
   if (isCenter == "true")
   {
    var left = (screen.width - width) / 2;
    var top = (screen.height - height) / 2;
    features += (features != '') ? ',' : '';
    features += ',left=' + left + ',top=' + top;
   }
  }
 }
 window.open(url, name, features + ((features != '') ? ',' : '') + 'width=' + width + ',height=' + height);
}

function toggleOption(container, optionId)
{
 var s=document.getElementById(container);
 s.options[optionId].selected = ! s.options[optionId].selected;
}

function toggleCheckBox(container, optionId)
{
 var s=document.getElementById(container + '_' + optionId);
 s.checked = ! s.checked;
}