diff --git a/build.properties b/build.properties
index 98f78e2d..ce13e79c 100644
--- a/build.properties
+++ b/build.properties
@@ -6,7 +6,7 @@
 PROJECT: openseadragon
 BUILD_MAJOR: 0
 BUILD_MINOR: 8
-BUILD_ID: 09
+BUILD_ID: 10
 BUILD: ${PROJECT}.${BUILD_MAJOR}.${BUILD_MINOR}.${BUILD_ID}
 VERSION: ${BUILD_MAJOR}.${BUILD_MINOR}.${BUILD_ID}
 
diff --git a/openseadragon.js b/openseadragon.js
index 13f71ee9..552dc40a 100644
--- a/openseadragon.js
+++ b/openseadragon.js
@@ -3,7 +3,7 @@
  * (c) 2010 OpenSeadragon
  * (c) 2010 CodePlex Foundation
  *
- * OpenSeadragon 0.8.09
+ * OpenSeadragon 0.8.10
  * ----------------------------------------------------------------------------
  * 
  *  License: New BSD License (BSD)
@@ -1636,11 +1636,12 @@ $.Viewer = function( options ) {
         }
     }
 
+    this.navControl = null;
     if ( this.config.showNavigationControl ) {
-        navControl = (new $.NavControl(this)).elmt;
-        navControl.style.marginRight = "4px";
-        navControl.style.marginBottom = "4px";
-        this.addControl(navControl, $.ControlAnchor.BOTTOM_RIGHT);
+        this.navControl = (new $.NavControl(this)).elmt;
+        this.navControl.style.marginRight = "4px";
+        this.navControl.style.marginBottom = "4px";
+        this.addControl(this.navControl, $.ControlAnchor.BOTTOM_RIGHT);
     }
 
     for ( i = 0; i < this.customControls.length; i++ ) {
@@ -1723,9 +1724,6 @@ $.Viewer.prototype = {
         this.profiler.endUpdate();
     },
 
-    getNavControl: function () {
-        return this._navControl;
-    },
     add_open: function (handler) {
         this.events.addHandler("open", handler);
     },
diff --git a/src/tilesource.js b/src/tilesource.js
index d2ced150..5a3d9aa6 100644
--- a/src/tilesource.js
+++ b/src/tilesource.js
@@ -57,14 +57,18 @@ $.TileSource.prototype = {
         return new $.Rect(px * scale, py * scale, sx * scale, sy * scale);
     },
 
-    getTileUrl: function(level, x, y) {
+    getTileUrl: function( level, x, y ) {
         throw new Error("Method not implemented.");
     },
 
-    tileExists: function(level, x, y) {
-        var numTiles = this.getNumTiles(level);
-        return level >= this.minLevel && level <= this.maxLevel &&
-                x >= 0 && y >= 0 && x < numTiles.x && y < numTiles.y;
+    tileExists: function( level, x, y ) {
+        var numTiles = this.getNumTiles( level );
+        return  level >= this.minLevel && 
+                level <= this.maxLevel &&
+                x >= 0 && 
+                y >= 0 && 
+                x < numTiles.x && 
+                y < numTiles.y;
     }
 };
 
diff --git a/src/viewer.js b/src/viewer.js
index 5b8fb317..4ce7e8d3 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -194,11 +194,12 @@ $.Viewer = function( options ) {
         }
     }
 
+    this.navControl = null;
     if ( this.config.showNavigationControl ) {
-        navControl = (new $.NavControl(this)).elmt;
-        navControl.style.marginRight = "4px";
-        navControl.style.marginBottom = "4px";
-        this.addControl(navControl, $.ControlAnchor.BOTTOM_RIGHT);
+        this.navControl = (new $.NavControl(this)).elmt;
+        this.navControl.style.marginRight = "4px";
+        this.navControl.style.marginBottom = "4px";
+        this.addControl(this.navControl, $.ControlAnchor.BOTTOM_RIGHT);
     }
 
     for ( i = 0; i < this.customControls.length; i++ ) {
@@ -281,9 +282,6 @@ $.Viewer.prototype = {
         this.profiler.endUpdate();
     },
 
-    getNavControl: function () {
-        return this._navControl;
-    },
     add_open: function (handler) {
         this.events.addHandler("open", handler);
     },