atm the infoMenu shows only server error if an element in the main menu is clicked.
the string "serverError" is hardcoded.
to show content of the element, the following steps have to be implemented:
db query to get the corresponding data
store query result as json array and send it to the client (getJson.php)
display the data with javascript (menu.js -> infoMenu.drawInfoContent)
atm the infoMenu shows only server error if an element in the main menu is clicked. the string "serverError" is hardcoded. to show content of the element, the following steps have to be implemented: