Javascript HTML right-click browser menu? Help with getting example working

i'm trying to get the followin开发者_运维问答g example set up on my computer:

http://deluxe-menu.com/popup-mode-sample.html

I've right clicked for the source code, copied the HTML into a file on my local computer and have saved the 5 javascript files (dmenu,data,add,data-popup-mode,data-popup-mode2).js into the same folder.

I have also swapped their image for one of my own which is located in the same directory.

When i right click my image it says

Error: dm_popup is not defined

However, i cannot seem to find where this has been declared. Can someone please help?

EDIT: I've also copied over the css files

You also need the dmenu_popup.js file, that function you need is included inside. It seems to be loaded by dmenu.js, that explains why you haven't seen it.