The only option left is to make the page wider....
This is a mod to force the wxmesomap.php page to use wide css,
the rest of your site can stay on a narrow theme or what ever the visitor has selected (narrow or wide).
Put this code at the very bottom of the Settings.php, but before the closing PHP tag:
Code:
// the code below will force your wxmesomap.php page to use a wide css template
if ( preg_match("/wxmesomap.php/i", $SITE['REQURI']) ){
$SITE['CSSscreen'] = str_replace ('-narrow.css','-wide.css',$SITE['CSSscreen']);
}