// remote scripting library
// (c) copyright 2005 modernmethod, inc

function sajax_debug(text) {
   if (sajax_debug_mode)
      alert(text);
}

function sajax_init_object() {
   sajax_debug("sajax_init_object() called..")

   var A;

   var msxmlhttp = new Array(
      'Msxml2.XMLHTTP.5.0',
      'Msxml2.XMLHTTP.4.0',
      'Msxml2.XMLHTTP.3.0',
      'Msxml2.XMLHTTP',
      'Microsoft.XMLHTTP');
   for (var i = 0; i < msxmlhttp.length; i++) {
      try {
         A = new ActiveXObject(msxmlhttp[i]);
      } catch (e) {
         A = null;
      }
   }

   if(!A && typeof XMLHttpRequest != "undefined")
      A = new XMLHttpRequest();
   if (!A)
      sajax_debug("Could not create connection object.");
   return A;
}

var sajax_requests = new Array();

function sajax_cancel() {
   for (var i = 0; i < sajax_requests.length; i++) 
      sajax_requests[i].abort();
}

function sajax_do_call(func_name, args) {
   var i, x, n;
   var uri;
   var post_data;
   var target_id;

   sajax_debug("in sajax_do_call().." + sajax_request_type + "/" + sajax_target_id);
   target_id = sajax_target_id;
   if (typeof(sajax_request_type) == "undefined" || sajax_request_type == "") 
      sajax_request_type = "GET";

   uri = sajax_remote_uri;
   if (sajax_request_type == "GET") {

      if (uri.indexOf("?") == -1) 
         uri += "?rs=" + escape(func_name);
      else
         uri += "&rs=" + escape(func_name);
      uri += "&rst=" + escape(sajax_target_id);
      uri += "&rsrnd=" + new Date().getTime();
      
      for (i = 0; i < args.length-1; i++) 
         uri += "&rsargs[]=" + escape(args[i]);

      post_data = null;
   } 
   else if (sajax_request_type == "POST") {
      post_data = "rs=" + escape(func_name);
      post_data += "&rst=" + escape(sajax_target_id);
      post_data += "&rsrnd=" + new Date().getTime();
      
      for (i = 0; i < args.length-1; i++) 
         post_data = post_data + "&rsargs[]=" + escape(args[i]);
   }
   else {
      alert("Illegal request type: " + sajax_request_type);
   }
   
   x = sajax_init_object();
   if (x == null) {
      if (sajax_failure_redirect != "") {
         location.href = sajax_failure_redirect;
         return false;
      } else {
         sajax_debug("NULL sajax object for user agent:\n" + navigator.userAgent);
         return false;
      }
   } else {
      x.open(sajax_request_type, uri, true);
      // window.open(uri);
      
      sajax_requests[sajax_requests.length] = x;
      
      if (sajax_request_type == "POST") {
         x.setRequestHeader("Method", "POST " + uri + " HTTP/1.1");
         x.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
      }
   
      x.onreadystatechange = function() {
         if (x.readyState != 4) 
            return;

         sajax_debug("received " + x.responseText);
      
         var status;
         var data;
         var txt = x.responseText.replace(/^\s*|\s*$/g,"");
         status = txt.charAt(0);
         data = txt.substring(2);

         if (status == "") {
            // let's just assume this is a pre-response bailout and let it slide for now
         } else if (status == "-") 
            alert("Error: " + data);
         else {
            if (target_id != "") 
               document.getElementById(target_id).innerHTML = eval(data);
            else {
               try {
                  var callback;
                  var extra_data = false;
                  if (typeof args[args.length-1] == "object") {
                     callback = args[args.length-1].callback;
                     extra_data = args[args.length-1].extra_data;
                  } else {
                     callback = args[args.length-1];
                  }
                  callback(eval(data), extra_data);
               } catch (e) {
                  sajax_debug("Caught error " + e + ": Could not eval " + data );
               }
            }
         }
      }
   }
   
   sajax_debug(func_name + " uri = " + uri + "/post = " + post_data);
   x.send(post_data);
   sajax_debug(func_name + " waiting..");
   delete x;
   return true;
}