Let's put some of these functions to use!
panfunction. 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.setCenter( new OpenLayers.LonLat(-42, 70), 2);
map.isValidLonLat( new OpenLayers.LonLat(-190, 20) );
As you can see, it's easy to call any of those map functions ...