showing = false;

    function toggleInfo() {
            if (showing == false) {
                if (document.all || document.getElementById) document.getElementById('imageinfo').style.visibility="visible";   // IE & Gecko
                else document.layers['imageinfo'].visibility="show"; // Netscape 4
                showing = true;
            }
            else {
                if (document.all || document.getElementById) document.getElementById('imageinfo').style.visibility="hidden";    // IE & Gecko
                else document.layers['imageinfo'].visibility="hide";    // Netscape 4
                showing = false;
        }
    }