// start ajaxrequest.js


// Following is a javascript function that makes a httprequest - AJAX. This is the AJAX bit and all that is needed in that manner.
// Only in this one we won't be using XML in our response, we will accept and handle
// pure text and html and display this response directly to the user within the
// desired <div id> tags. It can even be used to include pure html files as a substitute
// solution to the "old" frames method where as no php or other scripting language is nessesary on the server.
// but use it with care - it is not a search engine supported method and indexing will fail. Workaround for this is not included here

function MyAjaxRequest(target_div,file,check_div)
{
var MyHttpRequest = false;
var MyHttpLoading = 'Laster...'; // or use an animated gif instead: var MyHttpLoading = '<img src="loading.gif" border="0" alt="running" />';
var ErrorMSG = 'Sorry - No XMLHTTP support in your browser, buy a newspaper instead';

if(check_div)
{
var check_value = document.getElementById(check_div).value;
}
else
{
var check_value = '';
}



if(window.XMLHttpRequest) // client use Firefox, Opera etc - Non Microsoft product
{
try
{
MyHttpRequest = new XMLHttpRequest();
}
catch(e)
{
MyHttpRequest = false;
}
}
else if(window.ActiveXObject) // client use Internet Explorer
{
try
{
MyHttpRequest = new ActiveXObject("Msxml2.XMLHTTP");
}
catch(e)
{
try
{
MyHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
}
catch(e)
{
MyHttpRequest = false;
}
}
}
else
{
MyHttpRequest = false;
}



if(MyHttpRequest) // browser supports httprequest
{
var random = Math.random() * Date.parse(new Date()); // make a random string to prevent caching

var file_array = file.split('.'); // prepare to check if we have a query string or a html/htm file
if(file_array[1] == 'php') // no query string, just calling a php file
{
  var query_string = '?rand=' + random;
  }
  else if(file_array[1] == 'htm' || file_array[1] == 'html') // calling a htm or html file
  {
    var query_string = '';
    }
    else // we have presumable a php file with a query string attached
    {
      var query_string = check_value + '&rand=' + random;
      }
      
      
      MyHttpRequest.open("get", url_encode(file + query_string), true); // <-- run the httprequest using GET
      
      
      // handle the httprequest
      MyHttpRequest.onreadystatechange = function ()
      {
      if(MyHttpRequest.readyState == 4) // done and responded
      {
      document.getElementById(target_div).innerHTML = MyHttpRequest.responseText; // display result
      }
      else
      {
      document.getElementById(target_div).innerHTML = MyHttpLoading; // still working
      }
      }
      MyHttpRequest.send(null);
      }
      else 
      {
      document.getElementById(target_div).innerHTML = ErrorMSG; // the browser was unable to create a httprequest
      }
      }
      // end of "AJAX" function
      
      
      // Here follows a function to urlencode the string we run through our httprequest, it has nothing to do with AJAX itself
      // If you look carefully in the above httprequest you se that we use this url_encode function around the file and query_string
      // This is very handy since we are using GET in our httprequest and for instance
      // any occurrance of the char # (from textboxes etc) will brake the string we are sending to our file - we don't want that to brake!
      // It will also convert spaces to +
      
      function url_encode(string)
      {
      var string;
      var safechars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz/-_.&?=";
      var hex = "0123456789ABCDEF";
      var encoded_string = "";
      for(var i = 0; i < string.length; i++)
      {
      var character = string.charAt(i);
      if(character == " ")
      {
      encoded_string += "+";
      }
      else if(safechars.indexOf(character) != -1)
      {
      encoded_string += character;
      }
      else
      {
      var hexchar = character.charCodeAt(0);
      if(hexchar > 255)
      {
      encoded_string += "+";
      }
      else
      {
      encoded_string += "%";
      encoded_string += hex.charAt((hexchar >> 4) & 0xF);
      encoded_string += hex.charAt(hexchar & 0xF);
      }
      }
      }
      return encoded_string;
      }
      
      // end .js file