ArrowKeyEvents

	$(document).keydown(function(e){
		if (e.keyCode == 37) { 
		    var previous = self.currentX;
			self.currentX = self.limitXBounds(self.previousPageX(self.currentX));
			if (self.currentX !== previous) {
			  self.update();
			}
		   return false;
		}else if (e.keyCode == 39) { 
			var previous = self.currentX;
			self.currentX = self.limitXBounds(self.nextPageX(self.currentX));
			if (self.currentX !== previous) {
			  self.update();
			}
	
			return false;
		}
	});