Joomla extension

I have an existing website written in php that has for menus the following - date related - the menu turns on and off appearing and disapearing by dates of events. - this menu is a sub and it appears in right column. As code exists in already, I am hoping it can be adapted to joomla Its going to be difficult for you to quote, give me your best guess. I will pick a couple of developers and give them access to prior site and coding to view. I will also give access to new site, completed except for menus to view. You can then revise bids to suit.. Developer should have done something like this before and have a healthy list of work, and references. developer should be really smart and well trained, and experienced... Thinking you can do it will not get you the job. As code exists, I have placed in small project category, I have mocked up all changes as well, this mockup will be sent once I look at resumes and work. If you know of existing joomla extension that already does this, I would be willing to purchase and still pay you to integrate and make work exactly as desired. thank you