HTML - content on homepage moves when screen minimized

[wendyjames]

Hi

I`m building my first website this weekend and have nearly finished it but when I minimise the screen on the Home Page all my content moves and overlaps to the centre of the screen. The navigation bar and a row of photographs form a column down. What have  I missed? What HTML do I need to keep everything in its place?

Thanks

[kpac]

Can you post the code you have or a link to the site.