add info() function. Works like notice() but show messages in a div with class info-message.

update code to use info() instead of notice() when appropriate (non-error message)
add info-message class style in themes

mod/search.php

@@ -66,7 +66,7 @@ function search_content(&$a) {
 		$a->set_pager_total($r[0]['total']);
 
 	if(! $r[0]['total']) {
-		notice( t('No results.') . EOL);
+		info( t('No results.') . EOL);
 		return $o;
 	}