I plan to spend four days in Split. Anyone know of ferry companies which transport passengers up the Adriatic Coast to Rijeka?

No sooner than we arrived in Vienna, we found ourselves loading our backpacks again! I really am loving living out of a bag! The best bit is digging through it for clean clothes! Anyhow, we flew into Split, Croatia, and it really seemed like ages since we had flown. All our luggage had to be precisely packed with no liquids etc! What a hassle! W...