/* show/hide a specific XHTML element */
function toggleInfo(elem) {
	var el = document.getElementById(elem);
	el.style.display = (el && el.style.display == 'none') ? 'block' : 'none';
}

/* show/hide particularized for a image */
function showCloseLevel(idOpen, idClose) {
    //Show idOpen
    document.getElementById(idOpen).style.display = "";
    //Close idClose
    document.getElementById(idClose).style.display = "none";
}