if (document.images) {
  var n1_on = new Image();
  n1_on.src = "/img/nav1_on.gif";
  var n1_off = new Image();
  n1_off.src = "/img/nav1.gif";

  var n2_on = new Image();
  n2_on.src = "/img/nav2_on.gif";
  var n2_off = new Image();
  n2_off.src = "/img/nav2.gif";

  var n3_on = new Image();
  n3_on.src = "/img/nav3_on.gif";
  var n3_off = new Image();
  n3_off.src = "/img/nav3.gif";

  var n4_on = new Image();
  n4_on.src = "/img/nav4_on.gif";
  var n4_off = new Image();
  n4_off.src = "/img/nav4.gif";
}

if (!document.getElementById && !document.all) {
  alert("Your browser does not support DHTML. Pages will not be displayed correctly.");
}  

function roll_n1_on() {
  document.images["n1"].src = n1_on.src;
  
  if (document.getElementById) {
    document.getElementById("imm").style.visibility = "visible";
  }
  else if (document.all) {
    document.all.imm.style.visibility = "visible";
  }

}

function roll_n1_off() {
  document.images["n1"].src = n1_off.src;
  
  if (document.getElementById) {
    document.getElementById("imm").style.visibility = "hidden";
  }
  else if (document.all) {
    document.all.imm.style.visibility = "hidden";
  }
}

function roll_n2_on() {
  document.images["n2"].src = n2_on.src;
  
  if (document.getElementById) {
    document.getElementById("en").style.visibility = "visible";
  }
  else if (document.all) {
    document.all.en.style.visibility = "visible";
  }

}

function roll_n2_off() {
  document.images["n2"].src = n2_off.src;
  
  if (document.getElementById) {
    document.getElementById("en").style.visibility = "hidden";
  }
  else if (document.all) {
    document.all.en.style.visibility = "hidden";
  }
}

function roll_n3_on() {
  document.images["n3"].src = n3_on.src;
  
  if (document.getElementById) {
    document.getElementById("set").style.visibility = "visible";
  }
  else if (document.all) {
    document.all.set.style.visibility = "visible";
  }

}

function roll_n3_off() {
  document.images["n3"].src = n3_off.src;
  
  if (document.getElementById) {
    document.getElementById("set").style.visibility = "hidden";
  }
  else if (document.all) {
    document.all.set.style.visibility = "hidden";
  }
}

function roll_n4_on() {
  document.images["n4"].src = n4_on.src;
  
  if (document.getElementById) {
    document.getElementById("ng").style.visibility = "visible";
  }
  else if (document.all) {
    document.all.ng.style.visibility = "visible";
  }

}

function roll_n4_off() {
  document.images["n4"].src = n4_off.src;

  if (document.getElementById) {
    document.getElementById("ng").style.visibility = "hidden";
  }
  else if (document.all) {
    document.all.ng.style.visibility = "hidden";
  }
}

function changebg(item, color) {
  if (document.getElementById) {
    theone = eval("document.getElementById('"+item+"')");
    theone.style.background = color;
  }
  else if (document.all) {
    theone = eval("document.all['"+item+"']");
    theone.style.background = color;
  }  
}	

function footer_color (ident, color1) {
  if (document.getElementById) {
    x = eval("document.getElementById('"+ident+"')");
    x.style.color = color1;
  }
  else if (document.all) {
    x = eval("document.all['"+ident+"']");
    x.style.color = color1;
  } 
}