/********* Document Object Model Extension *********/
/*  BELLOUNDJA Abdelkader : a.belloundja@gmail.com */
/*  Provide the following methods :                
hasClassName
addClassName
removeClassName
getElementsByClassName
getCElementsByClassName
getCElementsByTagName
insertAfter
isChildOf
*/

function domExtensionE () {
	
	
	function hasClassName(className) {
		
		var cNames = this.className.split(' ');
		var names = className.split(' ');
		var has = true;
		var does = true;
		for (var i in names) {
			does = false;
			for (var j = 0; j < cNames.length && !does; j++) if (names[i] == cNames[j]) does = !does;
			has = has && does;
		}
		return has;
	}
	
	
	function addClassName(className) {
		var useless = / +/g;
		var nobug = /^ | $/g;
		var names = className.split(' ');
		var add = false;
		for (var i in names) {
			if (!this.hasClassName(names[i])) {
				this.className += " " + names[i];
				add = true;
			}
		}
		this.className = this.className.replace(useless, ' ').replace(nobug, '');
		return this;
	}
	
	function removeClassName(className) {
		var useless = / +/g;
		var nobug = /^ | $/g;
		var names = className.split(' ');
		var removed = true;
		var part = false;
		this.className = " " + this.className + " ";
		for (var i in names) {
			part = false;
			if (this.hasClassName(names[i])) {
				this.className = this.className.replace(" " + names[i] + " ", " ");
				part = !part;
			}
			removed = removed && part;
		}
		this.className = this.className.replace(useless, ' ').replace(nobug, '');
		return this;
	}
	
	
	function getElementsByClassName(className) {
		var a = this.getElementsByTagName('*');
		var b = new Array();
		for (var i in a) if ( a[i].hasClassName(className) ) b[b.length] = a[i];
		return b;
	}
	
	function getCElementsByClassName(className) {
		var a = this.childNodes;
		var b = new Array();
		for (var i in a) if ( a[i].hasClassName(className) ) b[b.length] = a[i];
		return b;
	}
	
	function getCElementsByTagName(tagName) { // verifier la casse.
		var arr = this.childNodes;
		var ret = new Array();
		for (var i in arr) {
			if (arr[i].tagName == tagName) ret[ret.length] = arr[i];
		}
		return ret;
	}
	
	function isChildOf(elem) {
		return (this.parentNode == elem);
	}
	
	function insertAfter(newNode, node) {
		if (node.nextSibling) return this.insertBefore(newNode, node.nextSibling);
		else return this.appendChild(newNode);
	}
	
	document.body.hasClassName = hasClassName;
	document.body.addClassName = addClassName;
	document.body.removeClassName = removeClassName;
	//document.body.getElementsByClassName = getElementsByClassName;
	//document.body.getElementsByClassName = getElementsByClassName;
	//document.body.getCElementsByTagName = getChildElementsByTagName;
	document.body.insertAfter = insertAfter;
	document.body.isChildOf= isChildOf;
	
	HTMLElement.prototype.hasClassName = hasClassName;
	HTMLElement.prototype.addClassName = addClassName;
	HTMLElement.prototype.removeClassName = removeClassName;
	//HTMLElement.prototype.getElementsByClassName = getElementsByClassName;
	//HTMLElement.prototype.getCElementsByClassName = getCElementsByClassName;
	//HTMLElement.prototype.getCElementsByTagName = getCElementsByTagName;
	HTMLElement.prototype.insertAfter = insertAfter;
	HTMLElement.prototype.isChildOf= isChildOf;
}