i read the tutorial on making your own boxes but it doesnt really go into drop downs

basically i want to have a drop down on the top of the site that lists all the products that a user can quickly just go to if they know exactly what they are looking for

so i copied the manufacturers box and renamed it to topdropdown.php
and inserted it into the top of the page

now i just need to figure out how to list all the products in it and make it go to the product pages when clicked on

is this listed anywhere that i missed?