var SessionList = {};

SessionList.onSessionListElementClicked = function(sessionId) {
    var sessionIndex = $("session-index")
    var session = sessionIndex.select("#" + sessionId)[0]
    var a = sessionIndex.select("#" + sessionId + " .abstract")[0]

    if (a.getStyle("display") != "none") {
        session.addClassName("session-collapsed")
        session.removeClassName("session-expanded")
    }
    else {
        session.addClassName("session-expanded")
        session.removeClassName("session-collapsed")
    }
}