function vraag4(){
        document.getElementById('telefoonnummer').style.display="block";
    }
    var startTimer4;
    function controleertelnr(){
        var tel = document.getElementById('telefoonnummer').value;
        var selected = document.getElementById('land').value;
        console.log(selected);
        if(selected == "nl"){
            if(tel.indexOf("+31") != 0){
                document.getElementById('telefoonnummer').style.border = "1px solid red";
            }
            else{
                document.getElementById('telefoonnummer').style.border = "1px solid green";
                document.getElementById('skypestatus').style.visibility = "visible";
                startTimer4 = setTimeout("document.getElementById('skypestatus').innerHTML = 'probeer later opnieuw'",10000);
            }
        }
        else if(selected == "be"){
            if(tel.indexOf("+32") != 0){
                document.getElementById('telefoonnummer').style.border = "1px solid red";
            }
            else{
                document.getElementById('telefoonnummer').style.border = "1px solid green";
                document.getElementById('skypestatus').style.visibility = "visible";
                startTimer4 = setTimeout("document.getElementById('skypestatus').innerHTML = 'probeer later opnieuw'",10000);
            }
        }
    }