Shows how to work around dateline issues, by wrapping the dateline on a number of layer types.
This is an example that shows wrapping the date line. Wrapping the date line is an option on the layer.
You can do it with a 'Layer.WMS' or a 'Layer.MapServer' layer.
var mapserv = new OpenLayers.Layer.MapServer( "OpenLayers Basic", "http://labs.metacarta.com/wms/vmap0", {layers: 'basic'}, {wrapDateLine: true} );