Reduce width of AFP in SAP Portal 7.3

Hi,

We have a requirement to reduce the width of our SAP Portal 7.3 with AJAX Framework page and make it appear in the centre of the browser window (like sdn). We want to do this to ensure that the portal width remains fixed irrespective of the monitor we use to see portal.

I have imported the com.sap.portal.navigation.afp.layout into NWDS. But am not exactly sure where to make the change.

Thanks,

Ajay