Extends MooTools' Element.Style to have the CSS3 juice.

Element.Style.CSS3.js

(function(){

var styles = {
	borderRadius: '@px @px @px @px/@px @px @px @px',
	MozBorderRadius: '@px @px @px @px/@px @px @px @px',
	WebkitBorderRadius: '@px @px @px @px/@px @px @px @px',
	boxShadow: '@px @px @px rgb(@, @, @)',
	MozBoxShadow: '@px @px @px rgb(@, @, @)',
	WebkitBoxShadow: '@px @px @px rgb(@, @, @)',
	textShadow: '@px @px @px rgb(@, @, @)'
};

var shortStyles = {
	borderRadius: {},
	MozBorderRadius: {},
	WebkitBorderRadius: {}
};

$extend(Element.Styles, styles);
$extend(Element.ShortStyles, shortStyles);

['TopLeft', 'TopRight', 'BottomLeft', 'BottomRight'].each(function(direction){
	var Short = shortStyles;
	var All = styles;
	var bdr = 'border' + direction + 'Radius';
	Short.borderRadius[bdr] = All[bdr] = '@px @px';
	var wbdr = 'WebkitBorder' + direction + 'Radius';
	Short.WebkitBorderRadius[wbdr] = All[wbdr] = '@px @px';
	var mbdr = 'MozBorderRadius' + direction.toLowerCase().capitalize();
	Short.MozBorderRadius[mbdr] = All[mbdr] = '@px @px';
});

var setStyle = Element.prototype.setStyle;
var getStyle = Element.prototype.getStyle;

var vendor = (Browser.Engine.gecko) ? 'Moz' : ((Browser.Engine.webkit) ? 'Webkit' : '');
var vendorize = function(property){
	switch (property){
		case 'borderTopLeftRadius':
		case 'borderTopRightRadius':
		case 'borderBottomRightRadius':
		case 'borderBottomLeftRadius':
			if (Browser.Engine.gecko){
				var matches = property.match(/^border((Top|Bottom)(Left|Right))Radius$/)
				property = 'BorderRadius' + matches[1].toLowerCase().capitalize();
			}
		case 'borderRadius':
		case 'boxShadow':
			property = vendor + property.capitalize();
		}
	return property;
};

Element.implement({
	
	setStyle: function(property, value){
		property = property.camelCase();
		if (!this.style[property]) property = vendorize(property);
		setStyle.apply(this, [property, value]);
		return this;
	},
	
	getStyle: function(property){
		property = property.camelCase();
		if (property == 'borderRadius'){
			var result = this.style[property];
			if (!$chk(result)){
				var horizontal = [], vertical = [];
				var style = Element.ShortStyles[property];
				for (var s in style){
					var st = this.getStyle(s).split(' ');
					horizontal.push(st[0]);
					vertical.push(st[1] || '0px');
				}
				result = horizontal.join(' ') + '/' + vertical.join(' ');
				return result;
			}
		}
		if (!this.style[property]) property = vendorize(property);
		return getStyle.apply(this, [property]);
	}
	
});

})();