diff --git a/src/overlay.js b/src/overlay.js
index aef365c5..a0c0c1ee 100644
--- a/src/overlay.js
+++ b/src/overlay.js
@@ -1,107 +1,123 @@
 
 (function( $ ){
     
-$.Overlay = function(elmt, loc, placement) {
-    this.elmt = elmt;
-    this.scales = (loc instanceof $.Rect);
-    this.bounds = new $.Rect(loc.x, loc.y, loc.width, loc.height);
-    this.placement = loc instanceof $.Point ? placement : $.OverlayPlacement.TOP_LEFT;    // rects are always top-left
-    this.position = new $.Point(loc.x, loc.y);
-    this.size = new $.Point(loc.width, loc.height);
-    this.style = elmt.style;
-};
 
-$.Overlay.prototype = {
+    $.OverlayPlacement = {
+        CENTER: 0,
+        TOP_LEFT: 1,
+        TOP: 2,
+        TOP_RIGHT: 3,
+        RIGHT: 4,
+        BOTTOM_RIGHT: 5,
+        BOTTOM: 6,
+        BOTTOM_LEFT: 7,
+        LEFT: 8
+    };
 
-    adjust: function(position, size) {
-        switch (this.placement) {
-            case $.OverlayPlacement.TOP_LEFT:
-                break;
-            case $.OverlayPlacement.TOP:
-                position.x -= size.x / 2;
-                break;
-            case $.OverlayPlacement.TOP_RIGHT:
-                position.x -= size.x;
-                break;
-            case $.OverlayPlacement.RIGHT:
-                position.x -= size.x;
-                position.y -= size.y / 2;
-                break;
-            case $.OverlayPlacement.BOTTOM_RIGHT:
-                position.x -= size.x;
-                position.y -= size.y;
-                break;
-            case $.OverlayPlacement.BOTTOM:
-                position.x -= size.x / 2;
-                position.y -= size.y;
-                break;
-            case $.OverlayPlacement.BOTTOM_LEFT:
-                position.y -= size.y;
-                break;
-            case $.OverlayPlacement.LEFT:
-                position.y -= size.y / 2;
-                break;
-            case $.OverlayPlacement.CENTER:
-            default:
-                position.x -= size.x / 2;
-                position.y -= size.y / 2;
-                break;
-        }
-    },
-    destroy: function() {
-        var elmt = this.elmt;
-        var style = this.style;
+    $.Overlay = function(elmt, loc, placement) {
+        this.elmt       = elmt;
+        this.scales     = (loc instanceof $.Rect);
+        this.bounds     = new $.Rect(loc.x, loc.y, loc.width, loc.height);
+        this.position   = new $.Point(loc.x, loc.y);
+        this.size       = new $.Point(loc.width, loc.height);
+        this.style      = elmt.style;
+        // rects are always top-left
+        this.placement  = loc instanceof $.Point ? 
+            placement : 
+            $.OverlayPlacement.TOP_LEFT;    
+    };
 
-        if (elmt.parentNode) {
-            elmt.parentNode.removeChild(elmt);
+    $.Overlay.prototype = {
+
+        adjust: function(position, size) {
+            switch (this.placement) {
+                case $.OverlayPlacement.TOP_LEFT:
+                    break;
+                case $.OverlayPlacement.TOP:
+                    position.x -= size.x / 2;
+                    break;
+                case $.OverlayPlacement.TOP_RIGHT:
+                    position.x -= size.x;
+                    break;
+                case $.OverlayPlacement.RIGHT:
+                    position.x -= size.x;
+                    position.y -= size.y / 2;
+                    break;
+                case $.OverlayPlacement.BOTTOM_RIGHT:
+                    position.x -= size.x;
+                    position.y -= size.y;
+                    break;
+                case $.OverlayPlacement.BOTTOM:
+                    position.x -= size.x / 2;
+                    position.y -= size.y;
+                    break;
+                case $.OverlayPlacement.BOTTOM_LEFT:
+                    position.y -= size.y;
+                    break;
+                case $.OverlayPlacement.LEFT:
+                    position.y -= size.y / 2;
+                    break;
+                case $.OverlayPlacement.CENTER:
+                default:
+                    position.x -= size.x / 2;
+                    position.y -= size.y / 2;
+                    break;
+            }
+        },
+        destroy: function() {
+            var elmt = this.elmt;
+            var style = this.style;
+
+            if (elmt.parentNode) {
+                elmt.parentNode.removeChild(elmt);
+            }
+
+            style.top = "";
+            style.left = "";
+            style.position = "";
+
+            if (this.scales) {
+                style.width = "";
+                style.height = "";
+            }
+        },
+        drawHTML: function(container) {
+            var elmt = this.elmt;
+            var style = this.style;
+            var scales = this.scales;
+
+            if (elmt.parentNode != container) {
+                container.appendChild(elmt);
+            }
+
+            if (!scales) {
+                this.size = $.Utils.getElementSize(elmt);
+            }
+
+            var position = this.position;
+            var size = this.size;
+
+            this.adjust(position, size);
+
+            position = position.apply(Math.floor);
+            size = size.apply(Math.ceil);
+
+            style.left = position.x + "px";
+            style.top = position.y + "px";
+            style.position = "absolute";
+
+            if (scales) {
+                style.width = size.x + "px";
+                style.height = size.y + "px";
+            }
+        },
+        update: function(loc, placement) {
+            this.scales = (loc instanceof $.Rect);
+            this.bounds = new $.Rect(loc.x, loc.y, loc.width, loc.height);
+            this.placement = loc instanceof $.Point ?
+                    placement : $.OverlayPlacement.TOP_LEFT;    // rects are always top-left
         }
 
-        style.top = "";
-        style.left = "";
-        style.position = "";
-
-        if (this.scales) {
-            style.width = "";
-            style.height = "";
-        }
-    },
-    drawHTML: function(container) {
-        var elmt = this.elmt;
-        var style = this.style;
-        var scales = this.scales;
-
-        if (elmt.parentNode != container) {
-            container.appendChild(elmt);
-        }
-
-        if (!scales) {
-            this.size = $.Utils.getElementSize(elmt);
-        }
-
-        var position = this.position;
-        var size = this.size;
-
-        this.adjust(position, size);
-
-        position = position.apply(Math.floor);
-        size = size.apply(Math.ceil);
-
-        style.left = position.x + "px";
-        style.top = position.y + "px";
-        style.position = "absolute";
-
-        if (scales) {
-            style.width = size.x + "px";
-            style.height = size.y + "px";
-        }
-    },
-    update: function(loc, placement) {
-        this.scales = (loc instanceof $.Rect);
-        this.bounds = new $.Rect(loc.x, loc.y, loc.width, loc.height);
-        this.placement = loc instanceof $.Point ?
-                placement : $.OverlayPlacement.TOP_LEFT;    // rects are always top-left
-    }
-
-};
+    };
 
 }( OpenSeadragon ));
diff --git a/src/overlayplacement.js b/src/overlayplacement.js
deleted file mode 100644
index 1e83640d..00000000
--- a/src/overlayplacement.js
+++ /dev/null
@@ -1,20 +0,0 @@
-
-(function( $ ){
-    
-    $.OverlayPlacement = function() {
-        throw Error.invalidOperation();
-    };
-
-    $.OverlayPlacement = {
-        CENTER: 0,
-        TOP_LEFT: 1,
-        TOP: 2,
-        TOP_RIGHT: 3,
-        RIGHT: 4,
-        BOTTOM_RIGHT: 5,
-        BOTTOM: 6,
-        BOTTOM_LEFT: 7,
-        LEFT: 8
-    };
-
-}( OpenSeadragon ));