function kalender( eform, eleft, eright, esingle, efunction )
{
	if(efunction == '')
	{
		k = window.open( "kalender.php?eform="+ eform +"&eleft="+eleft+"&eright="+eright+"&esingle="+esingle, "Kalender", "width=206, height=180, top=5, left=5, menubar=no, location=no, status=no, toolbar=no, scrollbars=no, resizable=yes");
	}
	else
	{
		k = window.open( "kalender.php?eform="+ eform +"&eleft="+eleft+"&eright="+eright+"&esingle="+esingle+"&efunction="+efunction, "Kalender", "width=206, height=180, top=5, left=5, menubar=no, location=no, status=no, toolbar=no, scrollbars=no, resizable=yes");
	}
	k.focus();
}