var pocet = parseInt(document.getElementById("pocet").innerHTML);
var pismeno = parseInt(document.getElementById("pismeno").innerHTML);

switch (event.which) {
  case " ".charCodeAt(0):
  case ".".charCodeAt(0):
  case ",".charCodeAt(0):
  case "!".charCodeAt(0):
  case "?".charCodeAt(0):
    pocet++;    
    if (pismeno == 1) {
        document.getElementById("pocet").innerHTML = pocet.toString();
        document.getElementById("pismeno").innerHTML = "0";
    }               
    break;
  default:
    document.getElementById("pismeno").innerHTML = "1";
}