Resizing browser breaks my site in half

[yeah00]

My site has three columns, one for the logo, one for the meny and one for the content. Problem is the columns break when i'm resizing the browser. I need to lock the columns in some way. Anyone got any tips?

http://alittle.no/shop





I tried with some "display" tags in my css, but that did not do the trick. Please help me!

[yeah00]

I got help and its now fixed! My css:

left:368px;
float:left;
clear:right;
page-break-after:avoid;
position:absolute;