code: function oldWebkitDirection(dir) {
  		dir = stringifyDirection(dir, true);
  		
  		if(reDeg.test(dir)) {
  			throw "The direction is an angle that can’t be converted.";
  		}
  		
  		var v = function(pos) {
  			return ~dir.indexOf(pos) ? '100%' : '0';
  		};
  		
  		return v('left') + ' ' + v('top') + ', ' + v('right') + ' ' + v('bottom');
  	}
docs: Creates direction definition for old Webkit gradients
  @param {String} direction
  @returns {String}