code: function(key) {
  		var style = this.css( key ),
  			val = [];
  
  		$.each( [ "em", "px", "%", "pt" ], function( i, unit ) {
  			if ( style.indexOf( unit ) > 0 ) {
  				val = [ parseFloat( style ), unit ];
  			}
  		});
  		return val;
  	}
docs: helper functions