Swapping the location of branding page and login table of the logon page

Hi Experts,

In our portal logon page  by default the branding image is on left and the login id details are on right. Now I need to swap these items , i.e branding image on right and login id details on left.So please let me know the way to do this. The version is SAP 7.3

Regards,

Anand