function toggleNewWindow(isChecked){
      if (!document.getElementsByTagName){
         return; 
      }
      var targetTag = "";
      if (isChecked){
        targetTag = "_blank";
      } else {
        targetTag = "_self";
      }
      
      var anchors = document.getElementsByTagName("a"); 
      for (var i=0; i<anchors.length; i++) { 
           var anchor = anchors[i]; 
           if (anchor.getAttribute("href") ){
                //alert("changed a: " + anchor.getAttribute("ID"));
                anchor.target = targetTag; 
            }
      } 
}