1) Artur, try www.sta.ch for connections from Geneva to Ibiza on any date and any airline - the site will show you a multitude of fares and connections.
2) Try www.sma.ch .

And finally, have you heard about the really handy site called www.google.ch ? If you use it for requests such as "swiss railways" and "weather in switzerland", you get the right links in an instant...