This is a little trayicon menu for use with the Fluxbox window manager (http://www.fluxbox.org). You can set the icon image using the same way you use on the .fluxbox/menu file to handle icons, a <full icon path here> string, but after the [begin] string, on the start of the menu file. For example:
[begin] (TaQ's box) </home/taq/icons/fb.xpm>
There is a fb.xpm file under this package img directory.
You can find more info and the sources at http://ftmenu.sourceforge.net