graphical jquery elements will neither help or damage your SEO.
it like you would ask if an image is damaging seo....
it`s not, except if its huge & loads so heavily that your visitors get annoyed & leave your page
the birdies & panning backgrounds in the example site are not very heavy images, they load fast enaugh, and there are just 4 moving elements, which is barable for most moderm browsers & decent computers
you might have heard that Flash damages SEO.... that used to be very true, most of it still is (although flash developers did find ways to overcome this disadvantage)
but this is not flash, its just an image
it wil NOT help your site except for visuals, if used elegantly, creatively & moderately
but it will do no damage either
Yes, this is a neat little script, if you understand all of that programming stuff. I came into internet marketing, not knowing anything about websites, programming, etc. But I have learned a lot, and even some programming, I would love to be able to take the time to learn all of it. But, it comes down to making money, or learning all aspects of it, and right now making money is on the top of my list. I commend all those programmers out there.