Lagomorph horizontal menu menu - it is a text file written in the following mode:
each line is ended with a semi-colon, except the last!!!
The location of the file has to be set in:
Settings/Site Administration/Appearance/Themes/Lagomorph - "URL for menu text file"
The general Moodle horizontal menu is set in:
Settings/Site Administration/Appearance/Themes/Theme settings - "Custom menu items"
The format of the menu is the same as above but without semi-colons.