var oldImage = null;
        var containerId = "preview-target";
        function swapImage(ele) {
            document.getElementById(containerId).src = ele.childNodes[1].src;
        }

        function restore() {
            document.getElementById(containerId).src = oldImage;
        }

        function setup() {
            oldImage = document.getElementById(containerId).src;
            var lists = document.getElementsByTagName("ul");
            var list = null;
            for(var i=0; i < lists.length; i++ ) {
                if( lists[i].className == 'hoverbox' ) {
                    list = lists[i];
                }
            }

            if( list ) {
                var links = list.getElementsByTagName("A");
                for( var i=0; i < links.length; i++ ) {
                    links[i].onmouseover = function() { swapImage(this); };
                    links[i].onmouseout = function() { restore(); };
                }
            }
        }