function kal_selmonat(o)
{
	t = top.location.href;
	t = t.replace(/[\&\?]monat\=[0-9]*/g, "");
	s = "&";
	if (t.indexOf("?") == -1)
		s = "?";
		
	t += s + "monat=" + o.value;
	top.location.href = t;
}

function kal_seljahr(o)
{
	t = top.location.href;
	t = t.replace(/[\&\?]jahr\=[0-9]*/g, "");
	s = "&";
	if (t.indexOf("?") == -1)
		s = "?";
		
	t += s + "jahr=" + o.value;
	top.location.href = t;
}