function setTrChange(id_s)
{
	var element_o = document.getElementById(id_s);
		element_o.style.display = element_o.style.display ? '' : 'none';
}

function setZeroValue(id_s)
{
	var value_s = document.getElementById(id_s).value;

	document.getElementById('hypotheek_waarde').value = '';
	document.getElementById('hypotheek_leven').value = '';
	document.getElementById('hypotheek_aflossingsvrij').value = '';

	document.getElementById(id_s).value = value_s;
}