I followed the advice in this topic:
and it didn't work. I tried drastically changing the length- I tried 1000, 1020, 2000 instead of 940 which is what is was originally, and it did not work. I want my banner to stretch out across the entire page.
I am using the twenty ten theme and my website is http://bucketonmyhead.com. Please help me out, I'm super new at this.