/* http://www.paradiso-design.net */

function change1a() {
 if(document.getElementById("bgr1").className == "nvis1")
  document.getElementById("bgr1").className = "on1";
}

function change1b() {
 if(document.getElementById("bgr1").className == "on1")
  document.getElementById("bgr1").className = "nvis1";
}