Open up an existing map, any page will do.

In Firebug, let's call the pan function. We'll move -30 degrees (30 degrees left) in the x (longitude) direction, and 30 degrees up in the y (latitude) direction. In the Firebug console, input and run the following:

map.pan(-30,30);

Now let's see how the setCenter function works.

map.setCenter( new OpenLayers.LonLat(-42, 70), 2);

Zoom out now with the zoomOut() function:

map.zoomOut();

Let's check to see if a coordinate outside the map's max extent is valid. The following should return False:

map.isValidLonLat( new OpenLayers.LonLat(-190, 20) );