<!--
  btn10=new Image();
  btn20=new Image();
  btn30=new Image();
  btn40=new Image();

  btn11=new Image();
  btn21=new Image();
  btn31=new Image();
  btn41=new Image();

  btn10.src="images/icon-books.gif"
  btn20.src="images/icon-cd.gif"
  btn30.src="images/icon-dvd.gif"
  btn40.src="images/icon-audio.gif"

  btn11.src="images/icon-books-on.gif"
  btn21.src="images/icon-cd-on.gif"
  btn31.src="images/icon-dvd-on.gif"
  btn41.src="images/icon-audio-on.gif"
  
//-->