Unzoom plug-in, rev 1.

diff --git a/plugins/unzoom.js b/plugins/unzoom.js
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+// Copyright (c) 2013 Google, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+
+/** 
+ * @fileoverview Plug-in for providing unzoom-on-hover.
+ *
+ * @author konigsberg@google.com (Robert Konigsberg)
+ */
+Dygraph.Plugins.Unzoom = (function() {
+  
+  "use strict";
+  
+  /**
+   * Draws the unzoom box.
+   *
+   * @constructor
+   */
+  var unzoom = function() {
+  };  
+    
+  unzoom.prototype.toString = function() {
+    return "Unzoom Plugin"; 
+  };
+
+  unzoom.prototype.activate = function(g) {
+    return {
+      willDrawChart: this.willDrawChart
+    };
+  };
+
+  unzoom.prototype.willDrawChart = function(e) {
+    var g = e.dygraph;
+    // API note:
+    // Consider adding a context parameter to activate and willDrawChart
+    // that can be used for storage so I don't have to do things like
+    // use up g.unzoomButton_.
+    if (g.hasOwnProperty("unzoomButton_")) {
+      return;
+    }
+
+    var elem = document.createElement("button");
+    elem.innerHTML = "Unzoom";
+    elem.style.display="none";
+    elem.style.position="absolute";
+    elem.style.top = '2px';
+    elem.style.left = '59px';
+    elem.style.zIndex = 1000;
+    var parent = g.graphDiv;
+    parent.insertBefore(elem, parent.firstChild);
+    elem.onclick = function() {
+      // TODO(konigsberg): doUnzoom_ is private.
+      g.doUnzoom_();
+    }
+    g.unzoomButton_ = elem;
+    Dygraph.addEvent(parent, "mouseover", function() {
+      g.unzoomButton_.style.display="block";
+    });
+
+    // TODO(konigsberg): Don't show unless the graph is zoomed.
+    Dygraph.addEvent(parent, "mouseout", function() {
+      g.unzoomButton_.style.display="none";
+    });
+  };
+
+  unzoom.prototype.destroy = function() {
+    delete g.unzoomButton_;
+    // TODO(konigsberg): Remove events installed above.
+  };
+
+  return unzoom;
+
+})();