jquery/ajax/ajax.js

// AJAX Plugin
// Docs Here:
// http://jquery.com/docs/ajax/

if ( typeof XMLHttpRequest == 'undefined' && typeof window.ActiveXObject == 'function') {
  var XMLHttpRequest = function() {
    return new ActiveXObject((navigator.userAgent.toLowerCase().indexOf('msie 5') >= 0) ? 
      "Microsoft.XMLHTTP" : "Msxml2.XMLHTTP");
  };
}

$.xml = function( type, url, data, ret ) {
  var xml = new XMLHttpRequest();

  if ( xml ) {
    xml.open(type || "GET", url, true);

    if ( data )
      xml.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');

    if ( ret )
      xml.onreadystatechange = function() {
        if ( xml.readyState == 4 ) ret(xml);
      };

    xml.send(data)
  }
};

$.httpData = function(r,type) {
  return r.getResponseHeader("content-type").indexOf("xml") > 0 || type == "xml" ?
    r.responseXML : r.responseText;
};

$.get = function( url, ret, type ) {
  $.xml( "GET", url, null, function(r) {
    if ( ret ) ret( $.httpData(r,type) );
  });
};

$.getXML = function( url, ret ) {
  $.get( url, ret, "xml" );
};

$.post = function( url, data, ret, type ) {
  $.xml( "POST", url, $.param(data), function(r) {
    if ( ret ) ret( $.httpData(r,type) );
  });
};

$.postXML = function( url, data, ret ) {
  $.post( url, data, ret, "xml" );
};

$.param = function(a) {
  var s = [];
  for ( var i in a )
    s[s.length] = i + "=" + encodeURIComponent( a[i] );
  return s.join("&");
};

$.fn.load = function(a,o,f) {
  // Arrrrghhhhhhhh!!
  // I overwrote the event plugin's .load
  // this won't happen again, I hope -John
  if ( a && a.constructor == Function )
    return this.bind("load", a);

  var t = "GET";
  if ( o && o.constructor == Function ) {
    f = o; o = null;
  }
  if (o != null) {
    o = $.param(o);
    t = "POST";
  }
  var self = this;
  $.xml(t,a,o,function(h){
  var h = h.responseText;
    self.html(h).find("script").each(function(){
      try {
        eval( this.text || this.textContent || this.innerHTML );
      } catch(e){}
    });
    if(f)f(h);
  });
  return this;
};