function flip(c) {
	if (document.getElementById(c).style.display=='none')
		show(c);
	else
		hide(c);
}
function show(c) {
	if (document.getElementById && document.getElementById(c)!= null)
		node = document.getElementById(c).style.display='';
	else if (document.layers && document.layers[c]!= null)
		document.layers[c].display = '';
	else if (document.all)
		document.all[c].style.display = '';
}
function hide(c) {
	if (document.getElementById && document.getElementById(c)!= null)
		node = document.getElementById(c).style.display='none';
	else if (document.layers && document.layers[c]!= null)
		document.layers[c].display = 'none';
	else if (document.all)
		document.all[c].style.display = 'none';
}