function over()
{
  dodaci = true;
  
  if (document.getElementById('d_firma').value.length<1)
  {
    if (document.getElementById('d_ulice').value.length<1 &&
       document.getElementById('d_mesto').value.length<1 &&
       document.getElementById('d_psc').value.length<1)
    {
      dodaci = false;
    }   
  }else{
    if (document.getElementById('d_ulice').value.length>0 &&
       document.getElementById('d_mesto').value.length>0 &&
       document.getElementById('d_psc').value.length>0) 
    {
      dodaci = false;
    }
  }

   if ((document.getElementById('jmeno').value.length<1 ||
       document.getElementById('prijmeni').value.length<1 ||
       document.getElementById('tel').value.length<1 ||
       document.getElementById('mail').value.length<1 ||
       document.getElementById('firma').value.length<1 ||
       document.getElementById('ulice').value.length<1 ||
       document.getElementById('mesto').value.length<1 ||
       document.getElementById('psc').value.length<1) ||       
       dodaci)
   {
     alert("Nevyplnili jste veskera potrebna data!");
     return false;
   }
}

function prepocti_bonus()
{
  cisla = true;
  spotrebovano = 0;
  for (i = 0; i < stoji.length; i++)
  {
    if (("0"+document.getElementById(i+'_bonus').value).match(/^\d*$/))
    {
      spotrebovano += parseInt("0"+document.getElementById(i+'_bonus').value, 10) * stoji[i];
    }else{
      cisla = false;
    }
  }
  
  if (!cisla)
  {
    for (i = 0; i < stoji.length; i++)
    {
      document.getElementById(i+'_bonus_max').innerHTML = ((bodu - (bodu % stoji[i])) / stoji[i]) + " ks";
    }
    document.getElementById('varovani').style.display = "block";;
  }else{
    for (i = 0; i < stoji.length; i++)
    {
      document.getElementById(i+'_bonus_max').innerHTML = (((bodu - spotrebovano) - ((bodu - spotrebovano) % stoji[i])) / stoji[i]) + " ks";
    }
    document.getElementById('varovani').style.display = "none";
  }
  
  document.getElementById('zbyva_bodu').innerHTML = (bodu - spotrebovano) + "bodu";
}