Animating CSS3 transforms (and other non-numerics) with jQuery.

gistfile1.js

$elem.animate({
	'customScale': someScaleValue
}, {
	step: function(now, fx){
		if ( fx.prop == 'customScale' ) {
			$elem.css({
				'-webkit-transform': 'scale('+now+')'
			});
		}
	}
}, 250);