I need hel to set up an proxy server with Squid (with cache), that insert on top of all page an banner (I prefer an js code, as I can insert info and some communication to the clients) (Budget: $30-250, Jobs: Apache Solr, PHP, Python)

Languages/Platform to be used : MySQL, Apache, PHP, AJAX, JQuery, Lucene, Solr Security and performance are top priority. For Eg: 1. No storing plain text password in DB or in client/server requests or similar basic security flaws... (Budget: $30-250, Jobs: AJAX, Apache Solr, Facebook, MySQL, PHP)