function tabNav(id, pos, action) {
		var strClassName = 'pageNav' + pos + '_' + action;
		document.getElementById(id).className = strClassName;
}

function showHide(id) {
	if (document.getElementById(id).style.display == 'block') {
		document.getElementById(id).style.display = 'none';
	} else {
		document.getElementById(id).style.display = 'block';
	}
}