img1=new Image();
        img1.src="/images/menu_plus.png";
        img2=new Image();
        img2.src="/images/menu_minus.png";

        function leftNav(theListId, theImageId) {
                foldercontent = document.getElementById(theListId);
                folderImage = document.getElementById(theImageId);
                if (foldercontent.style.display=="none")
                {
                        foldercontent.style.display="";
                        folderImage.src = "/images/menu_minus.png";
                }
                else
                {
                        foldercontent.style.display="none";
                        folderImage.src = "/images/menu_plus.png";
                }
        }