function setPrice() {

  var wd = document.getElementById('wd').value;
  var ht = document.getElementById('ht').value;

  w = parseInt(wd);
  h = parseInt(ht);

  if((isNaN(w)) || (w < 1)) { w = 1; }
  if((isNaN(h)) || (h < 1)) { h = 1; }

  var p = w * h * parseInt(document.getElementById('pp_price').value);

  document.getElementById('wd').value = w;
  document.getElementById('ht').value = h;

  document.getElementById('bk_price').innerHTML = '$' + p + ' ' + document.getElementById('pp_currency').value;
}

function resetOrder() {

  document.getElementById('wd').value = 1;
  document.getElementById('ht').value = 1;

  setPrice();

  document.getElementById('name').value = "";
  document.getElementById('mail').value = "";
  document.getElementById('mesg').value = "";
  document.getElementById('link').value = "http://";
  document.getElementById('logo').value = "";

  document.getElementById('term').checked = false;
}