GET ALL ELEMENTS OF A PAGE OR UNDER A TAG

/*
getAllElements.js
Author: Benjamin
Version: 1.1
Creation: Unknow
LastModification: 22.02.2011
Copyright: Free of use if you mention the author and source

Version 1.0
=> Retrieve all tags element in the page.
*/

/*
function getNodes(beginNode,bool)
Return: nothing
Atrributes:
  beginNode: the tag name to start from;
Method:
  get the children of the current tag;
  loop the childs
  when child is a tag do some work
  	if the child as children recall the function with the tag for beginNode
*/
function getNodes(beginNode){
	var nodes = beginNode;
	nodes = beginNode ? beginNode.childNodes : document.childNodes;
	for(var i=0; i < nodes.length ; i++){
		if(nodes[i].nodeType==1){
			/*
				Do something here
				In the exemple give the name of the tag in alert mode
			*/
			alert(nodes[i].nodeName);
			if(nodes[i].childNodes){
				getNodes(nodes[i]);
			}
		}
	}
}

//get all elements in the page includes head tags
getNodes();

//get only the element under the specified tag
var nodes = document.getElementsByTagName('div')[0]; //here the first div childs
getNodes(nodes);