How to fix my iPhone 3G screen?

Last week I decided I was going to update my iPhone applications, as I usually do, so I plugged in my iPhone to let it charge. When my iPhone was charged up I tried to update everything, but the right side of my screen wouldn't respond to touch. The majority of the left side works, but the other side won't. Is there a way to fix this or is it even worth trying to fix?

You can buy a screen online for around 35$ and install it yourself, just look it up on you tube.