Customize Joomla Template

i got the modules and plugins + jomsocial installed and setup. Just need to change the default Communa4 layout to <[login to view URL]> The only difference i need is that at the top menu, only the Jomsocial demo link is drop down (linking to all the other sub jomsocial links), the rest are a single menu link. Login button must show ajax form just like the template site. Otherwise, pretty much everything else must look like sample site. i am using Joomla 1.5.23, jomsocial 2.2 and also adsmanager latest