function roundPrice(price) {
  return Math.round(price);//*100)/100;
}
function calculatePrice(lang) {
  if (document.getElementById('numberOfDays').value>0 && (document.getElementById('winterSeason').checked || document.getElementById('summerSeason').checked)) {
    var price=document.getElementById('numberOfDays').value*(document.getElementById('summerSeason').checked ?summer_price :winter_price)/7*(document.getElementById('singleCabin').checked ?1.5 :1);
    document.getElementById('calculationResult').innerHTML='<table><tr><td><b>'+(lang=='en' ?'Price' :'Preis')+':</b></td><td>'+roundPrice(price)+' '+(lang=='en' ?'Euro plus Boat Kitty' :'Euro plus Bordkasse')+'</td></tr><tr><td><b>'+(lang=='en' ?'Advance payment' :'Anzahlung')+':</b></td><td>'+roundPrice(price/4)+ ' Euro</td></tr></table>';
  } else {
    document.getElementById('calculationResult').innerHTML='';
  }
}
document.getElementById('calculator').innerHTML='<div class="pricebox"><h2 class="caps">'+(lang=='en' ?'Price calculator' :'Preisrechner')+'</h2><table><tr><td colspan="2"><input type="radio" name="season" id="winterSeason" onclick="calculatePrice(lang);"> <label for="winterSeason">Winter</label><br><input type="radio" name="season" value="summer" id="summerSeason" onclick="calculatePrice(lang);"> <label for="summerSeason">'+(lang=='en' ?'Summer' :'Sommer')+'</label></td></tr><tr><td>'+(lang=='en' ?'Single cabin:' :'Einzelkabine:')+'</td><td><input type="checkbox" name="singleCabin" id="singleCabin" onclick="calculatePrice(lang);"></td></tr><tr><td>'+(lang=='en' ?'Number of days:' :'Anzahl der Tage:')+'</td><td><input type="text" id="numberOfDays" onkeyup="calculatePrice(lang);"></td></tr></table><div id="calculationResult"></div></div>';