// Global variables
var server_file_uri = "/cc/async_php.php"; // What to call. (PHP to Javascript.)
var async_direct = 0; // Write directly to the element

       ///////// API functions /////////

  // runs a function with a param[s] returns to a callback function
function async_call(js_callback_func, php_file_uri, php_function_name,
                    php_params) {

  var name = (js_callback_func == '' || js_callback_func == undefined)
           ? ""
           : "&c=" + js_callback_func;
  var argsr = Array.prototype.slice.call(arguments);
  args = js2php(argsr.slice(3), 'p');

  async_exec(name, encodeURIComponent(php_file_uri), php_function_name, args);
}

  // runs a function with a param[s] and array returns to a callback function
function async_call_array(js_callback_func, php_file_uri, php_function_name,
                          php_params, aa) {

  var name = (js_callback_func == '' || js_callback_func == undefined)
           ? ""
           : "&c=" + js_callback_func;
  var argsr = Array.prototype.slice.call(arguments);

  args = php_params;

  async_exec(name, encodeURIComponent(php_file_uri),
             php_function_name, args, aa);
}

  // runs a function with a param[s] with write to an id'ed element
  // used because there are times MSIE can not just write to the element
  // (inside forms, I think), but it messes up HTML tags
  // -- converts them for viewing
function async_write(id, php_file_uri, php_function_name, params, p2) {
  var name = (id == '' || id == undefined) ? "" : "&i=" + id;
  var argsr = Array.prototype.slice.call(arguments);
  args = js2php(argsr.slice(3),'p');

  async_exec(name, encodeURIComponent(php_file_uri), php_function_name, args);
}

  // runs a function with a param[s] with direct write to an id'ed element
  // used when HTML tags are in the response.  Be careful, there are places
  // MSIE can not do this.  (In forms, I think.)
function async_write_direct(id, php_file_uri, php_function_name, php_params) {
  async_direct = 1;
  var name = (id == '' || id == undefined) ? "" : "&i=" + id;
  var argsr = Array.prototype.slice.call(arguments);
  args = js2php(argsr.slice(3),'p');

  async_exec(name, encodeURIComponent(php_file_uri), php_function_name, args);
}

    ////////  Support functions /////////
function async_exec(name, php_file_uri, php_function_name, php_parms, aa) {

   // Uses AJAX to call the php and display the results

  var dir = (async_direct == 1) ? "&d=1" : "";
  var pa = (typeof(aa) == 'object') ? "&ka=1&" + js2php(aa,'a') : "";
  if (typeof(aa) == 'object') php_parms = "p=" + php_parms;

   // Create new JS element
  var jsel = document.createElement('SCRIPT');
  jsel.setAttribute("type","text/javascript");
  jsel.setAttribute("id","ajaxSelect");
  jsel.setAttribute("src",
    server_file_uri + '?'
        + 'u=' + encodeURI(php_file_uri) + '&f=' + php_function_name
        + '&' + php_parms + name + dir + pa);

   // Append JS element (therefore executing the 'AJAX' call for the reply)
   // It will return and run script
  var sp2 = document.body.firstChild;
  document.body.insertBefore(jsel, sp2);
}

// From: http://www.php.net/manual/en/function.json-decode.php
// paul at sfdio dot com 21-Jan-2007 03:08
// Modified for p[]. Jeff Hennick 8/25/10
// Modified for name param. Jeff Hennick 3/22/2011
function js2php(obj,name,path,new_path) {
  if (typeof(path) == 'undefined') var path=[];
  if (typeof(new_path) != 'undefined') path.push(new_path);
  var post_str = [];
  if (typeof(obj) == 'array' || typeof(obj) == 'object') {
    for (var n in obj) {
      post_str.push(js2php(obj[n],name,path,n));
    }
  }
  else if (typeof(obj) != 'function') {
    var base = path.shift();
    post_str.push(name + '[' + base + (path.length > 0
                              ? '[' + path.join('][') + ']'
                              : '') + ']=' + encodeURI(obj));
    path.unshift(base);
  }
  path.pop();
  return post_str.join('&');
}