Make div remains in same position when reduce browser width?

[keiren]

http://wthdesign.net/test/html/01-homepage.htmlI have an id created call "rightColumn", when I reduce the browser's width it gets push down to the next column, how do I make the id stays in its original position with scroll bar instead?I understand I can make an outer wrapper to hold off the "leftColumn", "middleColumn" and "rightColumn" but is there any other solution out there other than creating an outer wrapper?Thanks~