iframe Help Please

[kaytaro]

i was working on a site for my gf and mine and i need help with some coding :( . The back ground on the iframe doesnt like scroll smoothly. if anyone can help me id appriate it. site is http://www.asweetgirl.com/kaytaro/love/

and the bg image is at http://www.asweetgirl.com/kaytaro/love/back.jpg

if anyone can help me id really like it.

thanks

Anders~