Help required editing the header

[Max Taxable]

I don't find that image anywhere in the code or even in the list of media for the page:

/images/tf_ideal/misc/doc_bg.png
/favicon.ico
/images/tf_ideal/red/misc/navbar_container_bg.png
/images/tf_ideal/red/misc/navtab_bg.png
/images/tf_ideal/red/misc/navtab_arrow_gray.png
/images/tf_ideal/red/misc/t_bg.jpg
/images/tf_ideal/red/misc/logo.png
/images/tf_ideal/red/misc/close_login.png
/images/tf_ideal/misc/ctrl_button_bg.png
/images/tf_ideal/red/misc/breadcrumb_bg.png
/images/tf_ideal/red/misc/navbit-home.png
/images/tf_ideal/red/misc/body_bg.png
/images/tf_ideal/red/misc/page_title_bg.jpg
/images/tf_ideal/red/misc/page_title_inner_bg.png
/images/tf_ideal/red/misc/head_bg.png
/images/tf_ideal/red/buttons/collapse_40b.png
/images/tf_ideal/misc/subhead_bg.png
/images/tf_ideal/misc/tdg_bg.png
/images/tf_ideal/red/statusicon/forum_old-48.png
/images/tf_ideal/red/buttons/lastpost-right.png
/images/site_icons/profile.png
/images/site_icons/forum.png
/images/site_icons/message.png
/images/site_icons/blog.png
/images/site_icons/article.png
/images/tf_ideal/red/misc/tdg_bg.png
/images/tf_ideal/red/misc/users_online.png
/images/tf_ideal/red/misc/forum_stats.png
/images/tf_ideal/red/misc/forum_stats.png
/images/tf_ideal/red/misc/legend.png
/images/tf_ideal/red/statusicon/forum_new-16.png
/images/tf_ideal/red/statusicon/forum_old-16.png
/images/tf_ideal/red/statusicon/category-16.png
/images/tf_ideal/red/statusicon/forum_link-16.png
/images/tf_ideal/red/misc/b_bg.jpg
/images/tf_ideal/red/misc/doc_bg.png
/cron.php?rand=1353635075