13 years 7 months ago
First, welcome to Joomla Bamboo!
Boy, it's been awhile since I saw a Mambo site in production. I guess I'm not the only one that still has a live Mambo site!
Now, let's attempt to answer your question(s).
In order to get vertical superfish menus you will have to download a menu system extension. The best place to start this search is on the Joomla extension web site at this link;
extensions.joomla.org/search?q=menu+systems
I've been a Pro member of SW Menu Pro system since the early days of Mambo and they have been with us throughout all of the up-dated versions (including the current production version of Joomla). Their free version is feature rich but you can only have one menu system per web site. They use a combination of a component and module so you'll have no problems getting the 'transmenus' effect you currently are using. You will however have to style it from scratch!
The template your are using is called Techno City and will not work within the current Joomla 1.5 system. Again, you'll have to find a theme close to what you currently have and start the re-building process. You will be able to use your current template CSS style sheet as a guideline but that is about it... sorry!
Just about the only thing you'll be able to migrate over to Joomla 1.5 will be the actual content and images. In short, you are looking at building this site from scratch using your existing site purely as a guide.
Ed