function enhanceLinks() {   
    var links = document.getElementsByTagName("a");   
    var thisDomain = document.domain.split('www.');   
    var thisDomain = (thisDomain[1]) ? thisDomain[1] : document.domain ;   
     for (var i = 0; i < links.length; i++) {   
        if(links[i].href.indexOf(thisDomain) == -1 && links[i].href != '') {   
              links[i].target='_blank';
         }   
    }   
}   
function addLoadEvent(func) {   
  var oldonload = window.onload;   
  if (typeof window.onload != 'function') {   
    window.onload = func;   
  } else {   
    window.onload = function() {   
      if (oldonload) {   
        oldonload();   
      }   
      func();   
    }   
  }   
}   
  
addLoadEvent(function() {   
  enhanceLinks();   
}   
);