function checkForm(){
  if (document.getElementById("Name").value == '' || document.getElementById("Name").value == 'Name'){
    document.getElementById("Name").style.border = "2px solid red";
    resultName = 1;
  }else{
  	resultName = 0;
  }
  if (document.getElementById("Telefon").value == '' || document.getElementById("Telefon").value == 'Telefon'){
    document.getElementById("Telefon").style.border = "2px solid red";
    resultTelefon = 1;
  }else{
  	resultTelefon = 0;
  }
  if (document.getElementById("Email").value == '' || document.getElementById("Email").value == 'Email'){
    document.getElementById("Email").style.border = "2px solid red";
    resultMail = 1;
  }else{
  	resultMail = 0;
  }
  if (resultName == 0 && resultTelefon == 0 && resultMail == 0){
    document.getElementById("form").action = '/index.html'
    document.getElementById("form").submit();
  }
}

function clearField(x){
  if (document.getElementById(x).value == x){
    document.getElementById(x).value = '';
  }
}

function fillField(x){
  if (document.getElementById(x).value == ''){
    document.getElementById(x).value = x;
  }
}
function screenPopup (URL) {
  MeinFenster = window.open(URL);
  MeinFenster.focus();
}