function external_links()
{
    var c=document.getElementById('wrapper');
    if(c)
    {
        var ls=c.getElementsByTagName('a');
        for(var i=0;i<ls.length;i++){
            if(ls[i].getAttribute('rel')=='external')
            {
                ls[i].className+=ls[i].className?' extlink':'extlink';
                ls[i].title+='(opens in a new window)';
                ls[i].onclick=function(){window.open(this.href);return false}
            }
        }
    }
}