function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
   var anchor = anchors[i];
   if ((anchor.getAttribute("href") && (anchor.getAttribute("rel") == "external")))
     {anchor.target = "_blank";}
 }
};

function addListeners()
     {

      var backbutton = document.getElementById("backbutton");
      if(backbutton != null)
           {
            addEvent(backbutton, "click", goBack);
           };

     }; // addera lyssnare slutar


function grundkoll()
     {
      if(!document.getElementById)
           {
            return;
           };

      externalLinks();

      addListeners();

     };

function addEvent(eventElement, eventType, eventFunction)
     {
      if(eventElement.addEventListener) // dvs om man använder Firefox
           {
            eventElement.addEventListener(eventType, eventFunction, false);
            return true;
           }
      else if(eventElement.attachEvent) // dvs om man använder Explorer
           {
            var returnval = eventElement.attachEvent( "on" + eventType, eventFunction);
            return returnval;
           };
     };

addEvent(window, "load", grundkoll);