function setupLinks()
{
    var siteLinks = window.document.getElementsByTagName('a');

    for (var i=0; i < siteLinks.length; i++)
    {
   if (siteLinks[i].rel == 'external')
       {
     siteLinks[i].onclick    = externalSite;
     siteLinks[i].onkeypress = externalSite;
       }
    }
}

function externalSite()
{
    window.open(this.href, '', 'resizable,toolbar=yes,location=yes,scrollbars=yes,menubar=yes,status=yes');
    return false;
}

window.onload    = setupLinks;