if(document.images)
{
	//per Home
	image1a = new Image;
	image1b = new Image;
	image1a.src = "../img_links/home.png";
	image1b.src = "../img_links/homeB.png";
	//per site map
	image2a = new Image;
	image2b = new Image;
	image2a.src = "../img_links/sitemap_en.png";
	image2b.src = "../img_links/sitemap_enB.png";
	//per languages
	image3a = new Image;
	image3b = new Image;
	image3a.src = "../img_links/language_en.png";
	image3b.src = "../img_links/language_enB.png";
}

function swapOn(imgLocation)
  {
  	if(document.images)
	{
		document.images[imgLocation].src = eval(imgLocation + "b.src");
	}
  }
function swapOff(imgLocation)
  {
  	if(document.images)
	{
		document.images[imgLocation].src = eval(imgLocation + "a.src");
	}
  }