diff --git a/wp-includes/js/wp-ajax.js b/wp-includes/js/wp-ajax.js
deleted file mode 100644
index e3f63f7a4..000000000
--- a/wp-includes/js/wp-ajax.js
+++ /dev/null
@@ -1,100 +0,0 @@
-var WPAjax = Class.create();
-Object.extend(WPAjax.prototype, Ajax.Request.prototype);
-Object.extend(WPAjax.prototype, {
-	WPComplete: false, // onComplete function
-	WPError: false, // onWPError function
-	defaultUrl: '', // We get these from WPAjaxL10n
-	permText: '',
-	strangeText: '',
-	whoaText: '',
-
-	initialize: function(url, responseEl) {
-		var tempObj = this;
-		this.transport = Ajax.getTransport();
-		if ( !this.transport )
-			return false;
-		this.setOptions( {
-			parameters: 'cookie=' + encodeURIComponent(document.cookie),
-			onComplete: function(transport) { // transport = XMLHttpRequest object
-				if ( tempObj.parseAjaxResponse() ) {
-					if ( 'function' == typeof tempObj.WPComplete )
-						tempObj.WPComplete(transport);
-				} else if ( 'function' == typeof tempObj.WPError ) // if response corresponds to an error (bad data, say, not 404)
-					tempObj.WPError(transport);
-			}
-		});
-		this.url = url ? url : this.defaultUrl;
-		this.getResponseElement(responseEl);
-	},
-	addArg: function(key, value) {
-		var a = $H();
-		a[encodeURIComponent(key)] = encodeURIComponent(value);
-		this.options.parameters = $H(this.options.parameters).merge(a);
-	},
-	getResponseElement: function(r) {
-		var p = $(r + '-p');
-		if ( !p ) {
-			new Insertion.Bottom(r, "<span id='" + r + "-p'></span>");
-			var p = $(r + '-p');
-		}
-		this.myResponseElement = p;
-	},
-	parseAjaxResponse: function() { // 1 = good, 0 = strange (bad data?), -1 = you lack permission
-		if ( this.transport.responseXML && typeof this.transport.responseXML == 'object' && ( this.transport.responseXML.xml || 'undefined' == typeof this.transport.responseXML.xml ) ) {
-			var err = this.transport.responseXML.getElementsByTagName('wp_error');
-			if ( err[0] ) {
-				var msg = $A(err).inject( '', function(a, b) { return a + '<p>' + b.firstChild.nodeValue + '</p>'; } );
-				Element.update(this.myResponseElement,'<div class="error">' + msg + '</div>');
-				return false;
-			}
-			return true;
-		}
-		var r = this.transport.responseText;
-		if ( isNaN(r) ) {
-			Element.update(this.myResponseElement,'<div class="error"><p>' + r + '</p></div>');
-			return false;
-		}
-		var r = parseInt(r,10);
-		if ( -1 == r ) {
-			Element.update(this.myResponseElement,"<div class='error'><p>" + this.permText + "</p></div>");
-			return false;
-		} else if ( 0 == r ) {
-			Element.update(this.myResponseElement,"<div class='error'><p>" + this.strangeText + "</p></div>");
-			return false;
-		}
-		return true;
-	},
-	addOnComplete: function(f) {
-		if ( 'function' == typeof f ) { var of = this.WPComplete; this.WPComplete = function(t) { if ( of ) of(t); f(t); } }
-	},
-	addOnWPError: function(f) {
-		if ( 'function' == typeof f ) { var of = this.WPError; this.WPError = function(t) { if ( of ) of(t); f(t); } }
-	},
-	notInitialized: function() {
-		return this.transport ? false : true;
-	}
-});
-
-Event.observe( window, 'load', function() { Object.extend(WPAjax.prototype, WPAjaxL10n); }, false )
-
-Ajax.activeSendCount = 0;
-Ajax.Responders.register( {
-	onCreate: function() {
-		Ajax.activeSendCount++;
-		if ( 1 != Ajax.activeSendCount )
-			return;
-		wpBeforeUnload = window.onbeforeunload;
-		window.onbeforeunload = function() {
-			return WPAjax.whoaText;
-		}
-	},
-	onLoading: function() { // Can switch to onLoaded if we lose data
-		Ajax.activeSendCount--;
-		if ( 0 != Ajax.activeSendCount )
-			return;
-		window.onbeforeunload = wpBeforeUnload;
-	}
-});
-
-//Pretty func adapted from ALA http://www.alistapart.com/articles/gettingstartedwithajax
-function getNodeValue(tree,el){try { var r = tree.getElementsByTagName(el)[0].firstChild.nodeValue; } catch(err) { var r = null; } return r; }
diff --git a/wp-includes/script-loader.php b/wp-includes/script-loader.php
index 5814e9dfd..ecbb61055 100644
--- a/wp-includes/script-loader.php
+++ b/wp-includes/script-loader.php
@@ -48,14 +48,6 @@ function wp_default_scripts( $scripts ) {
 
 	$scripts->add( 'autosave', '/wp-includes/js/autosave.js', array('schedule', 'wp-ajax-response'), '20080508' );
 
-	$scripts->add( 'wp-ajax', '/wp-includes/js/wp-ajax.js', array('prototype'), '20070306');
-	$scripts->localize( 'wp-ajax', 'WPAjaxL10n', array(
-		'defaultUrl' => get_option( 'siteurl' ) . '/wp-admin/admin-ajax.php',
-		'permText' => __("You do not have permission to do that."),
-		'strangeText' => __("Something strange happened.  Try refreshing the page."),
-		'whoaText' => __("Slow down, I'm still sending your data!")
-	) );
-
 	$scripts->add( 'wp-lists', '/wp-includes/js/wp-lists.js', array('wp-ajax-response'), '20080411' );
 	$scripts->localize( 'wp-lists', 'wpListL10n', array(
 		'url' => get_option( 'siteurl' ) . '/wp-admin/admin-ajax.php'