Drop down custom HTML/CSS menu with sub menu

We have a simple drop down menu CSS need doing, please see the designs.

The project should be an exact replica of the designs including the scroll bar etc. I should be able to add/remove `s within the code and also control where the link goes too.

We would prefare is jquery was not used in this as we are already loding prototype.js in our project and it would conflict. Please do not send automated bids and only bid specific to this job.

Thanks