I am trying to replace the header of the theme "WordPress Default 1.6 by Michael Heilemann". For my site http://claytoncameron.com/blog/
I have changed the style.css in the "default folder" to-
background: url('images/blogmasterheader.jpg') no-repeat bottom center;
margin: 7px 9px 0;
In the documentation they talk about altering code in the header .php but i could not find the code they were talking about?