function change(id,color)

  {

    document.getElementById(id).style.backgroundImage = "url(optic/menue_left_bg_" + color + "_a.jpg)";

  }



  function changeback(id,color)

  {

    document.getElementById(id).style.backgroundImage = "url(optic/menue_left_bg_" + color + ".jpg)";

  }







  function setLayer(layer) 

  {

	document.getElementById(layer).style.display = 'block';

  }



  function clearLayer(layer)

  {

	document.getElementById(layer).style.display = 'none';

  }