hi

how di i make a box in th center of the page that usus margins

margin auto sets the left and righ side of box but the box remains at the top of the page.

cheers

Push it down with a top margin, use javascript to calculate it or take a "best guess".

10 -15% usually looks Ok

You should check our stickies:
http://www.webmaster-talk.com/css-fo...r-website.html

methods there for horizontal AND vertical centering.