Use a global variable for whether the banner images are being shown.

pages/helpers/banner.php

@@ -1,7 +1,10 @@
 #!/usr/bin/php
 <?php
 	// Dynamic testing of whether new images around the banner is wanted.
-	$show_pics = true;
+	if (!isset($GLOBALS["SHOW_BANNER_PICS"])) {
+		$GLOBALS["SHOW_BANNER_PICS"] = true;
+	}
+	$show_pics = $GLOBALS["SHOW_BANNER_PICS"];
 	$banner_width = $show_pics ? 6 : 12;
 ?>
 		<a href='/about/'>