function RequiredCheck2(){
    if(
    document.getElementById('check1').checked==false&&
    document.getElementById('check2').checked==false&&
    document.getElementById('check3').checked==false&&
    document.getElementById('check4').checked==false&&
    document.getElementById('check5').checked==false&&
    document.getElementById('check6').checked==false&&
    document.getElementById('check7').checked==false&&
    document.getElementById('check8').checked==false&&
    document.getElementById('check9').checked==false&&
    document.getElementById('check10').checked==false&&
    document.getElementById('check11').checked==false&&
    document.getElementById('check12').checked==false&&
    document.getElementById('check13').checked==false&&
    document.getElementById('check14').checked==false&&
    document.getElementById('check15').checked==false&&
    document.getElementById('check16').checked==false&&
    document.getElementById('check17').checked==false&&
    document.getElementById('check18').checked==false&&
    document.getElementById('check19').checked==false
    )
    {
        alert("Bitte kreuzen Sie bis zu 3 Bereiche an, aus denen Ihre Firma Produkte oder Dienstleistungen verkauft.");
        return false
    }else {
        return true
    }
}

function Zaehler(){
    var counter = 0
    if (document.getElementById('check1').checked)
    {counter = counter + 1}
    if (document.getElementById('check2').checked)
    {counter = counter + 1}
    if (document.getElementById('check3').checked)
    {counter = counter + 1}
    if (document.getElementById('check4').checked)
    {counter = counter + 1}
    if (document.getElementById('check5').checked)
    {counter = counter + 1}
    if (document.getElementById('check6').checked)
    {counter = counter + 1}
    if (document.getElementById('check7').checked)
    {counter = counter + 1}
    if (document.getElementById('check8').checked)
    {counter = counter + 1}
    if (document.getElementById('check9').checked)
    {counter = counter + 1}
    if (document.getElementById('check10').checked)
    {counter = counter + 1}
    if (document.getElementById('check11').checked)
    {counter = counter + 1}
    if (document.getElementById('check12').checked)
    {counter = counter + 1}
    if (document.getElementById('check13').checked)
    {counter = counter + 1}
    if (document.getElementById('check14').checked)
    {counter = counter + 1}
    if (document.getElementById('check15').checked)
    {counter = counter + 1}
    if (document.getElementById('check16').checked)
    {counter = counter + 1}
    if (document.getElementById('check17').checked)
    {counter = counter + 1}
    if (document.getElementById('check18').checked)
    {counter = counter + 1}
    if (document.getElementById('check19').checked)
    {counter = counter + 1}
    if (counter == 4) {
        alert('Leider haben Sie mehr als drei Bereiche angekreuzt. Bitte wählen Sie nur drei Möglichkeiten aus. Danke.')
        return false;
    }

}