// use to avoid coding long urls in multiple locations

function createTrackingImage(src) {
	var image = document.createElement("img");
	image.src = src;
	image.width = 1;
	image.height = 1;
	image.setAttribute("style", "margin:0px;padding:0px;border-style:none;");
	return image;
}

window.onload = function() {
	var elements = document.getElementsByTagName("span");
	for (var i = 0, n = elements.length; i < n; i++) {
		var elem = elements.item(i);
		if (elem.className) {
			var cName = elem.className;
			var dest = null;
			var trackingImage = null;
			

if (cName == "lonely-planet-vietnam") {
				dest = "http://www.amazon.com/gp/product/1741043069?ie=UTF8&tag=ndvietnam-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=1741043069";
				trackingImage =	createTrackingImage("http://www.assoc-amazon.com/e/ir?t=ndvietnam-20&l=as2&o=1&a=1741043069");
			} 

else if (cName == "frommers-vietnam") {
				dest = "http://www.amazon.com/gp/product/0470194073?ie=UTF8&tag=ndvietnam-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0470194073";
				trackingImage =	createTrackingImage("http://www.assoc-amazon.com/e/ir?t=ndvietnam-20&l=as2&o=1&a=0470194073");
			}
			


else if (cName == "rough-guide-vietnam") {
				dest = "http://www.amazon.com/gp/product/1843536161?ie=UTF8&tag=ndvietnam-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=1843536161";
				trackingImage =	createTrackingImage("http://www.assoc-amazon.com/e/ir?t=ndvietnam-20&l=as2&o=1&a=1843536161");
			}


else if (cName == "national-geographic-vietnam") {
				dest = "http://www.amazon.com/gp/product/0792262034?ie=UTF8&tag=ndvietnam-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0792262034";
				trackingImage =	createTrackingImage("http://www.assoc-amazon.com/e/ir?t=ndvietnam-20&l=as2&o=1&a=0792262034");
			}


else if (cName == "vietnam-history") {
				dest = "http://www.amazon.com/gp/product/0313341931?ie=UTF8&tag=advetravviet-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0313341931";
				trackingImage =	createTrackingImage("http://www.assoc-amazon.com/e/ir?t=advetravviet-20&l=as2&o=1&a=0313341931");
			}

else if (cName == "patriots") {
				dest = "http://www.amazon.com/gp/product/0142004499?ie=UTF8&tag=advetravviet-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0142004499";
				trackingImage =	createTrackingImage("http://www.assoc-amazon.com/e/ir?t=advetravviet-20&l=as2&o=1&a=0142004499");
			}

else if (cName == "no-peace") {
				dest = "http://www.amazon.com/gp/product/0743223497?ie=UTF8&tag=advetravviet-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0743223497";
				trackingImage =	createTrackingImage("http://www.assoc-amazon.com/e/ir?t=advetravviet-20&l=as2&o=1&a=0743223497");
			}

else if (cName == "illustrated-history") {
				dest = "http://www.amazon.com/gp/product/078180910X?ie=UTF8&tag=advetravviet-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=078180910X";
				trackingImage =	createTrackingImage("http://www.assoc-amazon.com/e/ir?t=advetravviet-20&l=as2&o=1&a=078180910X");
			}

else if (cName == "dream-street") {
				dest = "http://www.amazon.com/gp/product/1580051006?ie=UTF8&tag=advetravviet-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=1580051006";
				trackingImage =	createTrackingImage("http://www.assoc-amazon.com/e/ir?t=advetravviet-20&l=as2&o=1&a=1580051006");
			}

else if (cName == "sacred-willow") {
				dest = "http://www.amazon.com/gp/product/0195137876?ie=UTF8&tag=advetravviet-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0195137876";
				trackingImage =	createTrackingImage("http://www.assoc-amazon.com/e/ir?t=advetravviet-20&l=as2&o=1&a=0195137876");
			}

else if (cName == "tapestries") {
				dest = "http://www.amazon.com/gp/product/0316735604?ie=UTF8&tag=advetravviet-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0316735604";
				trackingImage =	createTrackingImage("http://www.assoc-amazon.com/e/ir?t=advetravviet-20&l=as2&o=1&a=0316735604");
			}

else if (cName == "vietnam-now") {
				dest = "http://www.amazon.com/gp/product/1586481835?ie=UTF8&tag=advetravviet-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=1586481835";
				trackingImage =	createTrackingImage("http://www.assoc-amazon.com/e/ir?t=advetravviet-20&l=as2&o=1&a=1586481835");
			}

else if (cName == "pleasures") {
				dest = "http://www.amazon.com/gp/product/0060192585?ie=UTF8&tag=advetravviet-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0060192585";
				trackingImage =	createTrackingImage("http://www.assoc-amazon.com/e/ir?t=advetravviet-20&l=as2&o=1&a=0060192585");
			}

else if (cName == "hot-sour") {
				dest = "http://www.amazon.com/gp/product/1579651143?ie=UTF8&tag=advetravviet-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=1579651143";
				trackingImage =	createTrackingImage("http://www.assoc-amazon.com/e/ir?t=advetravviet-20&l=as2&o=1&a=1579651143");
			}

else if (cName == "vietnamese-cooking") {
				dest = "http://www.amazon.com/gp/product/0794603475?ie=UTF8&tag=advetravviet-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0794603475";
				trackingImage =	createTrackingImage("http://www.assoc-amazon.com/e/ir?t=advetravviet-20&l=as2&o=1&a=0794603475");
			}

else if (cName == "authentic-recipes") {
				dest = "http://www.amazon.com/gp/product/0794603270?ie=UTF8&tag=advetravviet-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=0794603270";
				trackingImage =	createTrackingImage("http://www.assoc-amazon.com/e/ir?t=advetravviet-20&l=as2&o=1&a=0794603270");
			}



if (dest != null) {
				var a = document.createElement("a");
				a.href = dest;
				a.setAttribute("rel", "nofollow"); 
				a.setAttribute("target", "_blank");
				a.appendChild(elem.cloneNode(true));
				elem.parentNode.replaceChild(a, elem);
				if (trackingImage != null) {
					a.parentNode.appendChild(trackingImage);
				}
			}
		}
	}
};