diff --git a/markerclusterer/examples/advanced_example.html b/markerclusterer/examples/advanced_example.html
index 8de5869..daa9bea 100644
--- a/markerclusterer/examples/advanced_example.html
+++ b/markerclusterer/examples/advanced_example.html
@@ -64,62 +64,63 @@
         url: '../images/people35.png',
         height: 35,
         width: 35,
-        opt_anchor: [16, 0],
-        opt_textColor: '#ff00ff',
-        opt_textSize: 10
+        anchor: [16, 0],
+        textColor: '#ff00ff',
+        textSize: 10
       }, {
         url: '../images/people45.png',
         height: 45,
         width: 45,
-        opt_anchor: [24, 0],
-        opt_textColor: '#ff0000',
-        opt_textSize: 11
+        anchor: [24, 0],
+        textColor: '#ff0000',
+        textSize: 11
       }, {
         url: '../images/people55.png',
         height: 55,
         width: 55,
-        opt_anchor: [32, 0],
-        opt_textSize: 12
+        anchor: [32, 0],
+        textColor: '#ffffff',
+        textSize: 12
       }], [{
         url: '../images/conv30.png',
         height: 27,
         width: 30,
         anchor: [3, 0],
         textColor: '#ff00ff',
-        opt_textSize: 10
+        textSize: 10
       }, {
         url: '../images/conv40.png',
         height: 36,
         width: 40,
-        opt_anchor: [6, 0],
-        opt_textColor: '#ff0000',
-        opt_textSize: 11
+        anchor: [6, 0],
+        textColor: '#ff0000',
+        textSize: 11
       }, {
         url: '../images/conv50.png',
         width: 50,
         height: 45,
-        opt_anchor: [8, 0],
-        opt_textSize: 12
+        anchor: [8, 0],
+        textSize: 12
       }], [{
         url: '../images/heart30.png',
         height: 26,
         width: 30,
-        opt_anchor: [4, 0],
-        opt_textColor: '#ff00ff',
-        opt_textSize: 10
+        anchor: [4, 0],
+        textColor: '#ff00ff',
+        textSize: 10
       }, {
         url: '../images/heart40.png',
         height: 35,
         width: 40,
-        opt_anchor: [8, 0],
-        opt_textColor: '#ff0000',
-        opt_textSize: 11
+        anchor: [8, 0],
+        textColor: '#ff0000',
+        textSize: 11
       }, {
         url: '../images/heart50.png',
         width: 50,
         height: 44,
-        opt_anchor: [12, 0],
-        opt_textSize: 12
+        anchor: [12, 0],
+        textSize: 12
       }]];
 
       var markerClusterer = null;