diff --git a/lib/Rico/Corner.js b/lib/Rico/Corner.js
index 71289f115c..b3a2970a13 100644
--- a/lib/Rico/Corner.js
+++ b/lib/Rico/Corner.js
@@ -61,15 +61,15 @@ Rico.Corner = {
     *
     *     See changeColor (above) for algorithm explanation
     *
-    * @param {DOM} theDiv - A child of the outer <div> that was
+    * @param {DOM} theDiv A child of the outer <div> that was
     *                        supplied to the `round` method.
     *
-    * @param {int} newOpacity - The new opacity to use (1-10).
+    * @param {int} newOpacity The new opacity to use (0-1).
     */
     changeOpacity: function(theDiv, newOpacity) {
    
-        var mozillaOpacity = newOpacity / 10
-        var ieOpacity = 'alpha(opacity=' + newOpacity * 10 + ')';
+        var mozillaOpacity = newOpacity;
+        var ieOpacity = 'alpha(opacity=' + newOpacity * 100 + ')';
         
         theDiv.style.opacity = mozillaOpacity;
         theDiv.style.filter = ieOpacity;