var Builder = {
	NODEMAP: {
		AREA: 'map',
		CAPTION: 'table',
		COL: 'table',
		COLGROUP: 'table',
		LEGEND: 'fieldset',
		OPTGROUP: 'select',
		OPTION: 'select',
		PARAM: 'object',
		TBODY: 'table',
		TD: 'table',
		TFOOT: 'table',
		TH: 'table',
		THEAD: 'table',
		TR: 'table'
	},
	node: function(elementName) {
		elementName = elementName.toUpperCase();


		var parentTag = this.NODEMAP[elementName] || 'div';
		var parentElement = document.createElement(parentTag);
		try {
			parentElement.innerHTML = "<" + elementName + "></" + elementName + ">";
		} catch(e) {
		}
		var element = parentElement.firstChild || null;


		if (element && (element.tagName.toUpperCase() != elementName))
			element = element.getElementsByTagName(elementName)[0];


		if (!element) element = document.createElement(elementName);


		if (!element) return;


		if (arguments[1])
			if (this._isStringOrNumber(arguments[1]) ||
					(arguments[1] instanceof Array) ||
					arguments[1].tagName) {
				this._children(element, arguments[1]);
			} else {
				var attrs = this._attributes(arguments[1]);
				if (attrs.length) {
					try {
						parentElement.innerHTML = "<" + elementName + " " +
								attrs + "></" + elementName + ">";
					} catch(e) {
					}
					element = parentElement.firstChild || null;

					if (!element) {
						element = document.createElement(elementName);
						for (attr in arguments[1])
							element[attr == 'class' ? 'className' : attr] = arguments[1][attr];
					}
					if (element.tagName.toUpperCase() != elementName)
						element = parentElement.getElementsByTagName(elementName)[0];
				}
			}


		if (arguments[2])
			this._children(element, arguments[2]);

		return element;
	},
	_text: function(text) {
		return document.createTextNode(text);
	},

	ATTR_MAP: {
		'className': 'class',
		'htmlFor': 'for'
	},

	_attributes: function(attributes) {
		var attrs = [];
		for (attribute in attributes)
			attrs.push((attribute in this.ATTR_MAP ? this.ATTR_MAP[attribute] : attribute) +
					'="' + attributes[attribute].toString().escapeHTML().gsub(/"/, '&quot;') + '"');
		return attrs.join(" ");
	},
	_children: function(element, children) {
		if (children.tagName) {
			element.appendChild(children);
			return;
		}
		if (typeof children == 'object') {
			children.flatten().each(function(e) {
				if (typeof e == 'object')
					element.appendChild(e);
				else
				if (Builder._isStringOrNumber(e))
					element.appendChild(Builder._text(e));
			});
		} else
		if (Builder._isStringOrNumber(children))
			element.appendChild(Builder._text(children));
	},
	_isStringOrNumber: function(param) {
		return(typeof param == 'string' || typeof param == 'number');
	},
	build: function(html) {
		var element = this.node('div');
		$(element).update(html.strip());
		return element.down();
	},
	dump: function(scope) {
		if (typeof scope != 'object' && typeof scope != 'function') scope = window;

		var tags = ("A ABBR ACRONYM ADDRESS APPLET AREA B BASE BASEFONT BDO BIG BLOCKQUOTE BODY " +
				"BR BUTTON CAPTION CENTER CITE CODE COL COLGROUP DD DEL DFN DIR DIV DL DT EM FIELDSET " +
				"FONT FORM FRAME FRAMESET H1 H2 H3 H4 H5 H6 HEAD HR HTML I IFRAME IMG INPUT INS ISINDEX " +
				"KBD LABEL LEGEND LI LINK MAP MENU META NOFRAMES NOSCRIPT OBJECT OL OPTGROUP OPTION P " +
				"PARAM PRE Q S SAMP SCRIPT SELECT SMALL SPAN STRIKE STRONG STYLE SUB SUP TABLE TBODY TD " +
				"TEXTAREA TFOOT TH THEAD TITLE TR TT U UL VAR").split(/\s+/);

		tags.each(function(tag) {
			scope[tag] = function() {
				return Builder.node.apply(Builder, [tag].concat($A(arguments)));
			}
		});
	}
};