diff --git a/test/demo/m2/README.md b/test/demo/m2/README.md
index 392c1fd4..7885efec 100644
--- a/test/demo/m2/README.md
+++ b/test/demo/m2/README.md
@@ -1,12 +1,13 @@
 # To Do
 
-* Real book
-* Make sure adjacent pages aren't visible
-* Thumbs hover and active state (SVG overlay?)
 * Constraints
   * Thumbs: no zoom, no pan
   * Scroll: can't zoom out much, can't pan up and down
   * Book, Page: just the shown item
+* Consistent height for all pages (rather than width)
+* Make sure adjacent pages aren't visible
+* Thumbs hover and active state (SVG overlay?)
 * Resize on window resize
 * When going to thumbs, scroll to the proper part of the page
 * Show/hide pages?
+* Support 400+ page collections
diff --git a/test/demo/m2/index.html b/test/demo/m2/index.html
index c9b924ba..6cc52a42 100644
--- a/test/demo/m2/index.html
+++ b/test/demo/m2/index.html
@@ -5,6 +5,7 @@
         <script type="text/javascript" src='../../../build/openseadragon/openseadragon.js'></script>
         <script type="text/javascript" src='../../lib/jquery-1.9.1.min.js'></script>
         <script src="js/main.js"></script>
+        <script src="js/tilesources.js"></script>
         <style type="text/css">
 
             html,
diff --git a/test/demo/m2/js/main.js b/test/demo/m2/js/main.js
index 59885886..8b638cdf 100644
--- a/test/demo/m2/js/main.js
+++ b/test/demo/m2/js/main.js
@@ -7,7 +7,7 @@
         init: function() {
             var self = this;
 
-            var count = 50;
+            var count = 70;
 
             this.mode = 'none';
             this.pageBuffer = 0.05;
@@ -20,32 +20,13 @@
                 'page'
             ];
 
-            var tileSource = {
-                Image: {
-                    xmlns: "http://schemas.microsoft.com/deepzoom/2008",
-                    Url: "http://openseadragon.github.io/example-images/highsmith/highsmith_files/",
-                    Format: "jpg",
-                    Overlap: "2",
-                    TileSize: "256",
-                    Size: {
-                        Height: "9221",
-                        Width:  "7026"
-                    }
-                }
-            };
-
-            var tileSources = [];
-            for (var i = 0; i < count; i++) {
-                tileSources.push(tileSource);
-            }
-
             this.viewer = OpenSeadragon({
                 id: "contentDiv",
                 prefixUrl: "../../../build/openseadragon/images/",
                 autoResize: false,
                 // animationTime: 10,
                 // springStiffness: 2,
-                tileSources: tileSources
+                tileSources: this.tileSources.slice(0, count)
             });
 
             this.viewer.addHandler('open', function() {
@@ -65,12 +46,12 @@
                 }
             });
 
-            this.viewer.addHandler('pan', function(event) {
+            this.viewer.addHandler('canvas-drag', function() {
                 if (self.mode !== 'scroll') {
                     return;
                 }
 
-                var result = self.hitTest(event.center);
+                var result = self.hitTest(self.viewer.viewport.getCenter());
                 if (result) {
                     self.page = result.index;
                 }
diff --git a/test/demo/m2/js/tilesources.js b/test/demo/m2/js/tilesources.js
new file mode 100644
index 00000000..c39fdabd
--- /dev/null
+++ b/test/demo/m2/js/tilesources.js
@@ -0,0 +1,482 @@
+App.tileSources = [
+    "http://ids.lib.harvard.edu/ids/iiif/5981094/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981096/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981098/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981100/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981102/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981104/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981106/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981108/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981110/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981112/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981114/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981116/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981118/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981120/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981122/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981124/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981126/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981128/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981130/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981132/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981134/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981136/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981138/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981140/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981142/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981144/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981146/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981148/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981150/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981152/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981154/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981156/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981158/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981160/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981162/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981164/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981166/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981168/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981170/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981172/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981174/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981176/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981178/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981180/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981182/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981184/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981186/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981188/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981190/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981192/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981194/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981196/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981198/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981200/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981202/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981204/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981206/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981208/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981210/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981212/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981214/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981216/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981218/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981220/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981222/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981224/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981226/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981228/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981230/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981232/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981234/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981236/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981238/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981240/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981242/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981244/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981246/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981248/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981250/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981252/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981254/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981256/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981258/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981260/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981262/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981264/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981266/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981268/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981270/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981272/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981274/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981276/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981278/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981280/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981282/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981284/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981286/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981288/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981290/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981292/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981294/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981296/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981298/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981300/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981302/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981304/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981306/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981308/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981310/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981312/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981314/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981316/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981318/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981320/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981322/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981324/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981326/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981328/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981330/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981332/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981334/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981336/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981338/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981340/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981342/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981344/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981346/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981348/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981350/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981352/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981354/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981356/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981358/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981360/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981362/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981364/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981366/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981368/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981370/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981372/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981374/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981376/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981378/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981380/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981382/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981384/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981386/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981388/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981390/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981392/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981394/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981396/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981398/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981400/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981402/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981404/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981406/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981408/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981410/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981412/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981414/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981416/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981418/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981420/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981422/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981424/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981426/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981428/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981430/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981432/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981434/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981436/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981438/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981440/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981442/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981444/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981446/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981448/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981450/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981452/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981454/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981456/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981458/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981460/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981462/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981464/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981466/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981468/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981470/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981472/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981474/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981476/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981478/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981480/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981482/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981484/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981486/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981488/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981490/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981492/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981494/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981496/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981498/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981500/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981502/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981504/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981506/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981508/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981510/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981512/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981514/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981516/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981518/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981520/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981522/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981524/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981526/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981528/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981530/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981532/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981534/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981536/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981538/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981540/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981542/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981544/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981546/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981548/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981550/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981552/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981554/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981556/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981558/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981560/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981562/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981564/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981566/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981568/info.json",
+    "http://ids.lib.harvard.edu/ids/iiif/5981570/info.json",
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