Top Navigation with prototype.js in magento

I have used prototype.js on this site.

Custom Signs, Tags, Labels and Safety products - Emedco.com

Follow these steps to replicate the issue.

  1. Place your cursor on the logo in header
  2. Move your mouse to the body content scrolling over the menu
    ( Sign ) till customize it written in bold green.
  3. your will see when you move cursor to the body content, it still
    open the menu.

What i want is :

The top menu should not open if you move your cursor to the body
content.

It should only open if your mouse stay on the menu.

I think some delay or interval will work for this.

Kindly help me out to fix this issue as soon as possible.

Note : This issue occurs in almost every browser including firefox. I have attached the prototype file i am using for this.