fix for IE7 + IE8 compatibility

cfoe

2012-08-31 ebc41d2bed365692c35ccb99e26f51a9f3ebfa15

 server/plugins-available/squid_plugin.inc.php

@@ -41,7 +41,7 @@
   function onInstall() {
      global $conf;
      
      if($conf['services']['proxy'] == true && $conf['squid']['installed'] == true) {
      if(isset($conf['services']['proxy']) &&$conf['services']['proxy'] == true && isset($conf['squid']['installed']) && $conf['squid']['installed'] == true) {
         return true;
      } else {
         return false;