In order to reuse your index page generator for other components who have their own branding (eg., modeshape) we need to be able to pass in a different URL for the header image, eg. http://www.jboss.org/dms/modeshape/images/modeshape-banner-1180px.png in place of https://www.jboss.org/dms/tools/images/tools-banner.png

Note that images may not have the same dimensions (905w x 110h or 1280w x 110h).

Wondering why the modeshape banner's filename contains "1180" but the file is in fact 1280px wide shall be left as an exercise for the reader.