sky9,
You are right in so much as the runways are close but they do not have start and stop ends which are equal with each other, rather one starts at about the midpoint of the other. Also in my experience I have never seen aircraft operating off both runways at the same time. ATC have always made me wait for a landing aircraft on the other runway, before releasing me. Am I just lucky or do ATC normally allow aircraft to land and take-off on both runways without concern for separation?