if (_version > 10)
{
  arrow_img = new Image;
  arrow_img_on = new Image;
  arrow_img.src = "images/arrow_off.gif";
  arrow_img_on.src = "images/arrow_on.gif";
}

function aon(thisimg)
{
  if (_version > 10)
  {
    document[thisimg].src = arrow_img_on.src;
  }
}

function aoff(thisimg)
{
  if (_version > 10)
  {
    document[thisimg].src = arrow_img.src;
  }
}

if (_version > 10)
{
  home_img = new Image;
  home_img_on = new Image;
  home_img.src = "images/navbar_home.gif";
  home_img_on.src = "images/navbar_home_on.gif";

  aboutus_img = new Image;
  aboutus_img_on = new Image;
  aboutus_img.src = "images/navbar_aboutus.gif";
  aboutus_img_on.src = "images/navbar_aboutus_on.gif";

  software_img = new Image;
  software_img_on = new Image;
  software_img.src = "images/navbar_software.gif";
  software_img_on.src = "images/navbar_software_on.gif";

  material_img = new Image;
  material_img_on = new Image;
  material_img.src = "images/navbar_material.gif";
  material_img_on.src = "images/navbar_material_on.gif";

  graphics_img = new Image;
  graphics_img_on = new Image;
  graphics_img.src = "images/navbar_graphics.gif";
  graphics_img_on.src = "images/navbar_graphics_on.gif";

  network_img = new Image;
  network_img_on = new Image;
  network_img.src = "images/navbar_network.gif";
  network_img_on.src = "images/navbar_network_on.gif";

  website_img = new Image;
  website_img_on = new Image;
  website_img.src = "images/navbar_website.gif";
  website_img_on.src = "images/navbar_website_on.gif";

  contactus_img = new Image;
  contactus_img_on = new Image;
  contactus_img.src = "images/navbar_contactus.gif";
  contactus_img_on.src = "images/navbar_contactus_on.gif";
}

function highlight_img(thisimg)
{
  if (_version > 10)
  {
	document[thisimg].src = eval(thisimg + "_img_on.src");
  }
}

function unhighlight_img(thisimg)
{
  if (_version > 10)
  {
	document[thisimg].src = eval(thisimg + "_img.src");
  }
}

function opnPage(newLoc)
{
  selValue = newLoc.options[newLoc.selectedIndex].value;
  if (selValue != "")
  {
    window.location.href = selValue;
  }
}