Append to #page_content to be visible in fullscreen

Signed-off-by: Madhura Jayaratne <madhura.cj@gmail.com>

js/functions.js

@@ -2068,7 +2068,7 @@ function PMA_ajaxShowMessage(message, timeout)
     // Create a parent element for the AJAX messages, if necessary
     if ($('#loading_parent').length === 0) {
         $('<div id="loading_parent"></div>')
-        .prependTo("body");
+        .prependTo("#page_content");
     }
     // Update message count to create distinct message elements every time
     ajax_message_count++;