Multiple URL parameters are not working

1. I see the url when I do a view source of the page that should show the map. The url is in the jQuery.extend(Drupal.settings,.... line

2. Yes the domain is on a different server. I am using a service that returns a kml file based on the input parameters that I am trying to send.

3. I am not getting any additional errors. Its just that the & sign is substituted and I think it shouldn't be substituted.

Is there a place in the code that substitutes the & sign? Maybe I can try a hardcoded fix in order to check things out?

I have solved the problemy by building a poor-mans-cache. The code needs more work, error handling is not included yet. I am not a php developer, but the following is what I am working on:

function openlayers_get_cache($url, $filetype)
{
  $drupal_install_dir = '/var/www/httpdocs';
  $openlayers_cache_dir = '/sites/default/files/openlayers_ws_cache/'; // Directory must exist 

  $result = db_query("select redirect_url from openlayers_ws_caches where url = '%s' ", $url);

  while ($cache = db_fetch_object($result )) {
    return $cache->redirect_url;
  }

  // File not found in cache. Lets create it
  $filename = $openlayers_cache_dir . substr(md5(uniqid(rand(), true)), 0, 20) . '.' . $filetype; // 20 should be enough
  $fp = fopen($drupal_install_dir . $filename , 'w') or die("can't open file:" . $drupal_install_dir . $filename . "<br>"); 
  fwrite ($fp, file_get_contents($url));
  fclose($fp);

  db_query("insert into openlayers_ws_caches(url, cache_file, redirect_url) values ('%s', '%s', '%s')", $url, $drupal_install_dir . $filename, $filename);

  return $filename;
}

This is based on the following table

create table openlayers_ws_caches(
  url          varchar(1000) primary key,
  cache_file   varchar(500),
  redirect_url varchar(250),
  date_created timestamp(8) default now()
);

Current issues that I need to implement:

• Cache clearing code. My kml don't need to be refreshed very often. I am thinking about making this configurable per service that I am using.
• It's not a module. I am using this code directly in my panels page.
• Off-topic. I had to hard code the $drupal_install_dir because $base_path doesn't return a value in my page.

I think a proxy like functionality would be great to have in OpenLayers, but maybe something like this based on simple caching can be considered too?