diff --git a/openseadragon.js b/openseadragon.js
index 5906c54c..fc7caaa9 100644
--- a/openseadragon.js
+++ b/openseadragon.js
@@ -2425,49 +2425,58 @@ $.Profiler.prototype = {
 
 (function( $ ){
     
-$.Job = function(src, callback) {
-    this._image = null;
-    this._timeout = null;
-    this._src = src;
-    this._callback = callback;
+$.Job = function( src, callback ) {
+    this.image = null;
+    this.timeout = null;
+    this.src = src;
+    this.callback = callback;
+    //TODO: make TIMEOUT configurable
     this.TIMEOUT = 5000;
 };
 
 $.Job.prototype = {
-    _finish: function(success) {
-        this._image.onload = null;
-        this._image.onabort = null;
-        this._image.onerror = null;
-
-
-        if (this._timeout) {
-            window.clearTimeout(this._timeout);
-        }
-
-        var image = this._image;
-        var callback = this._callback;
-        window.setTimeout(function() {
-            callback(this._src, success ? image : null);
-        }, 1);
-    },
-    _onloadHandler: function() {
-        this._finish(true);
-    },
-    _onerrorHandler: function() {
-        this._finish(false);
-    },
     start: function() {
-        this._image = new Image();
-        this._image.onload = $.delegate(this, this._onloadHandler);
-        this._image.onabort = $.delegate(this, this._onerrorHandler);
-        this._image.onerror = $.delegate(this, this._onerrorHandler);
+        var _this = this;
+        this.image = new Image();
+        this.image.onload = function(){
+            finish( _this, true );
+        };
+        this.image.onabort = this.image.onerror = function(){
+            finish( _this, false );
+        };
+        this.timeout = window.setTimeout( function(){
+            onerror( _this );
+        }, this.TIMEOUT );
 
-        this._timeout = window.setTimeout($.delegate(this, this._onerrorHandler), this.TIMEOUT);
-
-        this._image.src = this._src;
+        this.image.src = this.src;
     }
 };
 
+function onload( job ){
+    finish( job, true );
+};
+
+function onerror( job ){
+    finish( job, false )
+};
+
+function finish( job, success ){
+    var image    = job.image,
+        callback = job.callback;
+
+    image.onload = null;
+    image.onabort = null;
+    image.onerror = null;
+
+    if ( job.timeout ) {
+        window.clearTimeout( job.timeout );
+    }
+    window.setTimeout( function() {
+        callback(job.src, success ? image : null);
+    }, 1 );
+
+};
+
 }( OpenSeadragon ));
 
 (function( $ ){
diff --git a/src/job.js b/src/job.js
index e9451dd7..d253390c 100644
--- a/src/job.js
+++ b/src/job.js
@@ -1,47 +1,56 @@
 
 (function( $ ){
     
-$.Job = function(src, callback) {
-    this._image = null;
-    this._timeout = null;
-    this._src = src;
-    this._callback = callback;
+$.Job = function( src, callback ) {
+    this.image = null;
+    this.timeout = null;
+    this.src = src;
+    this.callback = callback;
+    //TODO: make TIMEOUT configurable
     this.TIMEOUT = 5000;
 };
 
 $.Job.prototype = {
-    _finish: function(success) {
-        this._image.onload = null;
-        this._image.onabort = null;
-        this._image.onerror = null;
-
-
-        if (this._timeout) {
-            window.clearTimeout(this._timeout);
-        }
-
-        var image = this._image;
-        var callback = this._callback;
-        window.setTimeout(function() {
-            callback(this._src, success ? image : null);
-        }, 1);
-    },
-    _onloadHandler: function() {
-        this._finish(true);
-    },
-    _onerrorHandler: function() {
-        this._finish(false);
-    },
     start: function() {
-        this._image = new Image();
-        this._image.onload = $.delegate(this, this._onloadHandler);
-        this._image.onabort = $.delegate(this, this._onerrorHandler);
-        this._image.onerror = $.delegate(this, this._onerrorHandler);
+        var _this = this;
+        this.image = new Image();
+        this.image.onload = function(){
+            finish( _this, true );
+        };
+        this.image.onabort = this.image.onerror = function(){
+            finish( _this, false );
+        };
+        this.timeout = window.setTimeout( function(){
+            onerror( _this );
+        }, this.TIMEOUT );
 
-        this._timeout = window.setTimeout($.delegate(this, this._onerrorHandler), this.TIMEOUT);
-
-        this._image.src = this._src;
+        this.image.src = this.src;
     }
 };
 
+function onload( job ){
+    finish( job, true );
+};
+
+function onerror( job ){
+    finish( job, false )
+};
+
+function finish( job, success ){
+    var image    = job.image,
+        callback = job.callback;
+
+    image.onload = null;
+    image.onabort = null;
+    image.onerror = null;
+
+    if ( job.timeout ) {
+        window.clearTimeout( job.timeout );
+    }
+    window.setTimeout( function() {
+        callback(job.src, success ? image : null);
+    }, 1 );
+
+};
+
 }( OpenSeadragon ));