Alter script

i have a script that needs to be altered. You can see it here [login to view URL] I need to add a function that would allow me to go up and down. Similar to what you can see there, but left and right. I NEED BOTH DIRECTIONS. You can see an example that i have created here [login to view URL] - Click on the right arrow and the next page, you'll see that you can go up and down. I was able to do this by combining another script, but it's causing a lot of problems. So i want to alter the original. Also notice that if you're on the second page and you go down and then go back to the first page (click left arrow) and then you go back (click right arrow), you'll notice that it stayed on the second page. Touch needs to be added, so swiping can work, also keyboard arrows needs to work (up/down/left/right) I'll provide the script once you're selected as the winner. This project is urgent. Please ask any questions. Thanks Jan