if (document.layers)
{
        ns=1;
        ie=0;
        dc=0;
}
else if (document.getElementById)
{
        ns=0;
        ie=0;
        dc=1;
}
else if (document.all)
{
        ns=0;
        ie=1;
        dc=0;
}
else
        location.href="404.html";

var Menu = new Array("info","chat","chatter","links");

/* Verbirgt alle Menüelemente */
function menu_clear()
{
	if (dc)
	{
		for(i=0; i < Menu.length; i++)
		{
			document.getElementById(Menu[i]).style.visibility="hidden";
		}
	}
	else if (ie)
	{
		for(i=0; i < Menu.length; i++)
		{
			document.all[Menu[i]].style.visibility="hidden";
		}
	}
	else if (ns)
	{
		for(i=0; i < Menu.length; i++)
		{
			document.layers[Menu[i]].visibility="hide";
		}
	}
}

/* Zeigt das ausgewählte Menüelement an */
function menu_show(which)
{
        menu_clear();
        if (dc)
        {
        	document.getElementById(which).style.visibility="visible";
        }
        else if (ie)
        {
                document.all[which].style.visibility="visible";
        }
        else if (ns)
        {
                document.layers[which].visibility="show";
        }
}