lue = "-";
            } else if (buttonObj.value == "-") {
                // Collapse all
                collapseAll(boxList);
                buttonObj.value = "+";
            }
        }
        
        /**
        * Closes all boxes in a given list.
        *
        * @param boxList Array of box IDs
        */
        function collapseAll(boxList) {
            var idx;
            for (idx = 0; idx < boxList.length; idx++) {
                var boxObj = getElementObject(boxList[idx]);
            