Crowdfund Project Page

The hardest part of this project was the Javascript portion. Specifically trying to update the price on the screen live. I had to jump through hoops trying to get that working properly and it's still not the best it can be. If I pledge an amount, it adds that to the total. but when I pledge a second time, the amount is added only to the original price instead of what its worth currently. Is there any way I can get it to continually update as long as I don't refresh the page? Thanks! Happy coding!