diff --git a/examples/wmst.html b/examples/wmst.html
index d08db26071..255c6a2280 100644
--- a/examples/wmst.html
+++ b/examples/wmst.html
@@ -35,7 +35,7 @@ var map,ia_wms;
   <body onload="init()">
     <h1>OpenLayers Example</h1>
     <p>WMS-T example: update the times, and the radar image will change. Uses Layer.changeParams. Thanks to David Bitner for the inspiration, the original code, and the kick in the butt!</p>
-    <input type='text' id='time'  value="2005-08-29T13:00:00Z" onChange='ia_wms.changeParams({"time":this.value});' >
+    <input type='text' id='time'  value="2005-08-29T13:00:00Z" onChange='ia_wms.mergeNewParams({"time":this.value});' >
     <div id="map"></div>
   </body>
 </html>
