function new_window() 
{
   var arrAnchors = document.getElementsByTagName("a");
   for (var i = 0; i < arrAnchors.length; i++) 
   {	
      if (arrAnchors[i].getAttribute("href").search("Banner.aspx")>=0) 
	  {
         arrAnchors[i].setAttribute("target", "_blank");
      }
   }
   
   //alert (arrAnchors[2].getAttribute("href"));
}

window.onload = new_window;