var mediaBarItemIDs = [];
    var currentMediaBarItemID;
    var currentIndex;
    var timeout;
	function ShowMediaBarItem(itemID) {

        clearTimeout(timeout);

        currentMediaBarItemID = itemID;
    
        for (var i = 0; i < mediaBarItemIDs.length; i++) {
            document.getElementById("MediaBarItem_" + mediaBarItemIDs[i]).className = "MediaBarItem_Normal";
            document.getElementById("MediaBarButtonItem_" + mediaBarItemIDs[i]).className = "MediaBarButtonItem_Normal";
            if ("MediaBarItem_" + mediaBarItemIDs[i] == itemID) {
                currentIndex = i;
            }
        }

        document.getElementById(itemID).className = "MediaBarItem_Active";
        document.getElementById("MediaBarButtonItem_" + mediaBarItemIDs[currentIndex]).className = "MediaBarButtonItem_Active"

        if (currentIndex == mediaBarItemIDs.length - 1)
            timeout = setTimeout("ShowMediaBarItem('MediaBarItem_" + mediaBarItemIDs[0] + "')", 4000);
        else
            timeout = setTimeout("ShowMediaBarItem('MediaBarItem_" + mediaBarItemIDs[currentIndex + 1] + "')", 4000);
    }