function ikkuna(urli,leveys,korkeus) {
  var poppari = window.open(urli,'jpyhup','width='+leveys+',height='+korkeus+',scrollbars=no');
  poppari.focus();
}

window.onload = function() {
  var links = document.getElementsByTagName("a");
  for (i=0;i<links.length;i++) {
    if (links[i].getAttribute('rel') == 'external') {
      links[i].target="_blank";
    }
  }
}