[OpenLayers-Dev] Centering Map

[YuGo]

Hi
I want  centered map this example.
http://www.openlayers.org/dev/examples/controls.html

I tried to append follows in the script, but it did not work.
	 map.setCenter(new OpenLayers.LonLat(138.8452,36.23541), 5);

How I adjust zoom and center the map?