Hating lj at the moment. I just lost the coding for my banner while trying to change it to a new one.

Anyone have the code for adding a banner in component?
Edited to add: typical, just when I give up and post about it, I find the text I saved with the code*grumble grumble*

I apparantly still suck though, I want to make the background of the lj white, but have no idea how to do it, anyone? Precise coding would be helpful.