function clickBack() {
 if (!document.getElementsByTagName) return; 
 var anchors = document.getElementsByTagName("a"); 
 for (var i=0; i<anchors.length; i++) { 
   var anchor = anchors[i]; 
   if (anchor.className == "linkback")  {
	   //var newDestiny = eval(history.back())
		anchor.onclick = goBack;
   }		
 } 
} 

function goBack() {
		history.back();
		return false;
}


function externalLinks() { 
 if (!document.getElementsByTagName) return; 
 var anchors = document.getElementsByTagName("a"); 
 for (var i=0; i<anchors.length; i++) { 
   var anchor = anchors[i]; 
   if (anchor.getAttribute("href") && 
       anchor.getAttribute("rel") == "external") 
	anchor.target = "_blank"; 
 } 
} 

function getThumbnailImages() { 
	if (!document.getElementsByTagName) return; 
	var anchors = document.getElementsByTagName("a"); 
	for (var i=0; i<anchors.length; i++) { 
		var anchor = anchors[i]; 
		if (anchor.className == "thumbnail")  {
			anchor.onclick = changeImage;   
		}		
	} 
} 

function changeImage() {
	var actualImage = document.getElementById('image-holder');
	var actualSliceImage = (actualImage.src).split("/");
	
	var newThumbnail = actualSliceImage[0]+"..//"+actualSliceImage[2]+"./"+actualSliceImage[3]+"./"+actualSliceImage[4]+"./"+actualSliceImage[5]+"/thumb_"+actualSliceImage[6];

	var newImage = this.firstChild.src;
	var newImage = this.href;
	//this.href = actualImage.src;
	//alert(this.title);
	//document.getElementById('imagen-principal-txt').innerHTML = this.title;
	//this.firstChild.src = newThumbnail;
	actualImage.src = newImage;

	location.href= "#canvas";
	return false;
}

window.onload = function() {
	clickBack();
	externalLinks();
	getThumbnailImages();
}