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