CSS writer

/*-----------------------------------------------------------------------------
 * CSS writer
 *  Example Source
	CSS.add(
		'body { background: #eee; color: #333; }',
		'#id .class { display: block; width: 100%; }',
		'a:link, a:visited { color: #00f; }',
		'a:active, a:hover { color: #f00; }'
	);
	var value1 = CSS.get('#wrapper', 'width');
	var value2 = CSS.get($('id'), 'color', 'hover');
 *-------------------------------------------------------------------------- */
 
var CSS = {
	_add: function (selector, property) {
		var css = document.styleSheets[0];
		if (css.addRule)
			css.addRule(selector, '{' + property + '}');
		else if (css.insertRule)
			css.insertRule(selector + '{' + property + '}', css.cssRules.length);
	},
	add: function () {
		$A(arguments).join('').split('}').remove('').forEach(function (css) {
			var tmp = css.split('{');
			CSS._add(tmp[0], tmp[1]);
		});
	},
	get: function (selector, property, pseudo) {
		if (isString(selector)) {
			var sheets = document.styleSheets;
			(sheets[0].rule) && (selector = selector.replace(/\*/g, ''));
			for (var i = 0, len = sheets.length; i < len; ++i) {
				var sheet = sheets[i].rule || sheets[i].cssRules;
				for (var j = 0, l = sheet.length; j < len; ++j) {
					var css = sheet[i];
					if (css.selectorText.toLowerCase() == selector.toLowerCase())
						return css.style[property];
				}
			}
			return null;
		} else
			return (
				(selector.currentStyle) ? selector.currentStyle[property.toCamelize()] :
				(document.defaultView.getComputedStyle) ? document.defaultView.getComputedStyle(selector, pseudo).getPropertyValue(property.toSelector()) :
				''
			);
	}
}
 
/*
 * Extend
 */
 
function $A(v) {
	if (!v) return [];
	if (isArray(v))
		return v;
	if (v.toArray)
		return v.toArray();
	else {
		var len = v.length;
		var res = new Array(len);
		for (var i = 0; i < len; ++i)
			res[i] = v[i];
		return res;
	}
}
 
Array.prototype.filter || (Array.prototype.filter = function (callback, thisobj) {
	var res = [];
	for (var i = 0, len = this.length; i < len; ++i)
		callback.call(thisobj, this[i], i, this) && res.push(this[i]);
	return res;
});
 
Array.prototype.remove = function (rule) {
	return this.filter(function (val) {
		return (val != rule);
	});
}
 
Array.prototype.forEach || (Array.prototype.forEach = function (callback, thisobj) {
	for (var i = 0, len = this.length; i < len; ++i)
		callback.call(thisobj, this[i], i, this);
});
 
String.prototype.toCamelize = function () {
	return this.replace(/\-(.)/g, function (x, y) {
		return y.toUpperCase();
	});
}
 
String.prototype.toSelector = function () {
	return this.replace(/([A-Z])/g, '-$1').toLowerCase();
}