I tried and I am really not sure that I can open your page:) //Note later: It opened, a bit slow maybe, but it did:)
As to the code - if you change some parts of it, so as to make your layout wider, you'll have to check everything for consistency:) Like, if you have two columns, they are set to be of specific width, in concordance with the overall page width. So if you change the width of the container, you'll have to modify other parts of the code as well:)
If you are not very strong in CSS, why not selecting another, wider theme for your blog? :-)
But if you want to do it yourself, then try to match the new width of
#page with other elements - left column, right column, etc. Increase their width a bit as well. Make some computations. Experiement (better on a test page;-)
Hope this helps:)
PS Currently your layout is 760px wide, yes?