function afficher_cache(eltId)
{
	var elt = document.getElementById(eltId);
	elt.style.display = (elt.style.display == "block") ? "none" : "block";
}

function popup(url, target)
{
	w = 800;
	h = 675;
	l = (screen.width-w)/2;
	t = (screen.height-h)/2;
	widthHeight = "width="+w+",height="+h+",left="+l+",top="+t+",menubar=no,resizable=yes,scrollbars=no,status=no,toolbar=no,location=no";
	window.open(url,target,widthHeight);
	return true
}

function openchat(oForm)
{
	if (oForm.nick.value.length == 0)
	{
		alert ('Vous devez saisir un pseudonyme !');
	}
	else
	{
		s = oForm.style.value + '&tx_chat_pi1[username]=' + oForm.nick.value + '&tx_chat_pi1[alternate_username]=' + oForm.autrenick.value;
		popup(s,'chatroom');
	}
	return false;
}