Fix CVE-2007-5000:

* modules/mappers/mod_imagemap.c (menu_header): Fix
  cross-site-scripting issue by escaping the URI, and ensure that a
  charset parameter is sent in the content-type to prevent
  autodetection by broken browsers.

Reported by: JPCERT


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@603282 13f79535-47bb-0310-9956-ffa450edef68