function MenuArrow (pos, action) {
	var pom1 = window.parent.document.getElementById('mlt_'+pos);
	var pom2 = window.parent.document.getElementById('mgt_'+pos);
	if ( action == 1) {
		pom1.style.visibility = 'visible';
		pom2.style.visibility = 'visible';
	} else {
		pom1.style.visibility = 'hidden';
		pom2.style.visibility = 'hidden';
	}
	return;
}

function sa (pos, action) {
	var pom1 = window.parent.document.getElementById('slt_'+pos);
	var pom2 = window.parent.document.getElementById('sgt_'+pos);
	if ( action == 1) {
		pom1.style.visibility = 'visible';
		pom2.style.visibility = 'visible';
	} else {
		pom1.style.visibility = 'hidden';
		pom2.style.visibility = 'hidden';
	}
	return;
}

function valid_objed () {
	if (document.forms.souhrn.jmeno.value == '' || document.forms.souhrn.tel.value == '') {//nevyplnene povinne udaje
		alert ('Ve formuláři je nutné vyplnit minimálně jméno a telefon!');
		return false;
	} else {
		document.forms.souhrn.submit();
	}
}