change of site width or move the sidebar out of the content area.

Hi, I hope you can help. For the desktop I want to change my site width or move the sidebar out of the content area. Before I had no sidebar and I loved the width. Now I want to use the sidebar, however the content width is getting to small for my liking. I prefered to have the full width (1240 px) for the content and an expention for the sidebar (the menu, header and footer have to expand also, so full width is instead of 1240 px for example 1480 px which I can divided in 240 px for the sidebar and 1240 px for the content). An other solution is placing the sidebar in the margin instead of the content area. I hope you can understand what I mean and give me a solution. Thanks in advance! Best Regards, Ellen http://www.kattenfotografie.com