Modified the width from 1290px to 900px, the primary links go out of the page

Hello all,
I am using this theme for my simple site, please review it.

http://stone.vh.paanjoyhost.cn/

I modified the style.css
#page {
background-color: #f4f2f2;
margin: 0 auto;
width: 70%; (original value is 100%)
max-width: 1290px;
}
Two wierd things happened,
- i found my primary links go out of the page, does anybody know how to adapt it to my new width?
- this modification seems has no effect on Opera browser, though it works in ie7. but the opera still has 1290px width.Does anybody know why?

thanks a lot.
Andrew