potresti fare così
codice:
<script type="text/javascript">
<!--
function linkTarget(){
  if(document.getElementById && document.getElementsByTagName){
    var el=document.getElementById('id_div').getElementsByTagName('A');
    for(var k=0;k<el.length;k++){
      if(el[k].href) el[k].target='_blank';
    }
  }
}
window.onload=linkTarget;
//-->
</script>
ciao