Rollimage = new Array()

  Rollimage[0]= new Image(121,153)
  Rollimage[0].src = "images/logo_ovr.png"

  Rollimage[1] = new Image(121,153)
  Rollimage[1].src = "images/logo.png"
  
   function SwapOut(){
    document.Logo.src = Rollimage[0].src;
    return true;
  }

  function SwapBack(){
    document.Logo.src = Rollimage[1].src; 
    return true;
  }