I am having the same problem that lots of other people seem to have had...trying to increase the size of my header in my Imbalance 2 theme blog, to go across the whole page!
I have been doing lots of reading: and have tried the solution offered here: http://en.forums.wordpress.com/topic/enlarging-your-header-image-in-imbalance2?replies=4#post-790098, using multiple images, and no change seems to occur...
I do have the CSS upgrade, and am using (or trying to) an image that is 1000px wide, by 350pix high.
I would like this to simply stretch across the whole screen (I have the Fluid option selected).
I am sure I am just missing something really obvious, and I am trying to learn how CSS works, but I admit I am very new to it so thank you for your patience.
Thank you so much. WordPress really is amazing.
The blog I need help with is aboxwelltravelled.com.