function checkDatum( obj ){
	var erg;
	var match = /^(\d{2})(\d{2})(\d{4})$/;
	var str = obj.value;
	if( erg = match.exec( str ) ){
		obj.value = erg[1] + "." + erg[2] + "." + erg[3];
		return 1;
	}
	match = /^(\d{2})(\d{2})(\d{2})$/;
	
	if( erg = match.exec( str ) ){
		obj.value = erg[1] + "." + erg[2] + ".20" + erg[3];
		return 1;
	}
	
}