function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}
function rewriteOutboundLinks() {
	if(!document.getElementsByTagName) return;	
	var anchors = document.getElementsByTagName("a");
	for (var i = 0; i < anchors.length; i++) {
		var anchor = anchors[i];
		if (anchor.className&&anchor.className=='external') anchor.target = '_blank';
	}
}
addLoadEvent(function() 
{
	rewriteOutboundLinks();
});