Header menu Drop down menu disappears when the mouse goes off of the main menu.

When you are at the home page of my site, and you drag the mouse over the menu, the drop down automatically appears, however when you go to click on one of the submenu buttons, the menu disappears. I have been tinkering with the web site and I wonder if this has anything to do with that. It is every time but most of the time you either have to drag it really quick down or just wait a second. http://www.therivernashville.com is the site. I have ftp’s the website and am trying to change it through the back door but I can’t find the solution. If you know anything could you please help! Thank yoU!