var aImages  =  [ "~/media/Images/C/CareTech-Plc/Banners/banner1.ashx",   
                        "~/media/Images/C/CareTech-Plc/Banners/banner2.ashx",   
                        "~/media/Images/C/CareTech-Plc/Banners/banner3.ashx"   
                      ];   
      var oImage   =  null;   
      var iIdx     =  0;   
      function play(){   
        try{   
          //look only once in DOM and cache it   
          if(oImage===null){   
            oImage  =  window.document.getElementById("imgHolder");   
          }   
          oImage.src  =  aImages[(++iIdx)%(aImages.length)];   
          setTimeout('play()',5000);   
        }catch(oEx){   
          //some error handling here   
        }   
      }