92423 drop down menu

Currently, our website [login to view URL] has a very disorganized Menu configuration, I need a type of drop down menu system that: 1) works and looks similar to that on [login to view URL] 2) works and looks good in both IE & Firefox 3) is easy to add/remove main, sub and sub-sub-nav items 4) is Search Engine crawlable (MOST IMPORTANT!) Currently, the entire site is written in html as I do not have any php/mysql knowledge, however, that posses the problem of my updating the entire site whenever we want to make changes to the header or footer. I'd like this to be addresses in this mod, where, it is very easy for me to add new elements going forward. ADDITIONAL INFORMATION IF REQ'D: Currently, the site is configured in the following way: 1) look & feel for main nav pages (e.g. [login to view URL], look & feel for sub nav pages e.g. [login to view URL] and look & feel of the stuff_for_sale section which can be found at [login to view URL] 2) essentially, I try to provide as much info as I can on the Caribbean island destination, so that I can sell things like Accommodations, tours, car rentals, scuba diving, weddings, etc.