one of the documented procedures in this installation of the ACS
ad_decorate_top   simple_headline   potential_decoration
What it does:
Use this for pages that might or might not have an image defined in ad.ini; if the second argument isn't the empty string, ad_decorate_top will make a one-row table for the top of the page
Defined in: /web/philip/packages/acs-core/defs-procs.tcl

Source code:

    if [empty_string_p $potential_decoration] {
	return $simple_headline
    } else {
	return "<table cellspacing=10><tr><td>$potential_decoration<td>$simple_headline</tr></table>"