function clearAll() {
  if (document.occasion.f_prijs1.value == "van") { 
    document.occasion.f_prijs1.value = ""; }
  if (document.occasion.f_prijs2.value == "tot") { 
    document.occasion.f_prijs2.value = ""; }
  if (document.occasion.f_bouwj1.value == "van") { 
    document.occasion.f_bouwj1.value = ""; }
  if (document.occasion.f_bouwj2.value == "tot") { 
    document.occasion.f_bouwj2.value = ""; }
  if (document.nieuweautos.p_prijs_min.value == "van") { 
    document.nieuweautos.p_prijs_min.value = ""; }
  if (document.nieuweautos.p_prijs_max.value == "tot") { 
    document.nieuweautos.p_prijs_max.value = ""; }
  if ((document.occasion.f_pc_cijfers.value == "postcode") || (document.occasion.f_pc_cijfers.value == "post"))	{ 
    document.occasion.f_pc_cijfers.value = ""; }
  if ((document.occasion.f_straal_postc.value == "str(km)") || (document.occasion.f_straal_postc.value == "str"))	{ 
    document.occasion.f_straal_postc.value = ""; }
}

function setVestiging(cijfers) {
    document.occasion.f_pc_cijfers.value = cijfers;
    document.occasion.f_straal_postc.value = "1";
}


function checkVestiging() {
    document.occasion.f_pc_cijfers.value = document.occasion.f_vestiging.value;
    document.occasion.f_straal_postc.value = "1";
}

function checkVestiging2() {
 document.occasion.f_pc_cijfers.value = document.occasion.f_vestiging.value;
 if (document.occasion.f_pc_cijfers.value == 3846) {
  document.occasion.f_straal_postc.value = "4";
	} 
if (document.occasion.f_pc_cijfers.value == 3704) {
  document.occasion.f_straal_postc.value = "3";
	} 
 else {
  document.occasion.f_straal_postc.value = "1";
 }
}