function e(val){
return document.getElementById(val)
}

function trim(fr) {
fr = fr + ""
return fr.replace(/^\s+|\s+$/,'');
}


function velden1(){
var msg = "De volgende velden zijn leeg of niet juist ingevuld:\n";
var gaan = 1
if( trim(e("antwoord_open").value) ==""){msg = msg + "\n - Uw antwoord";gaan = 0;}
if(gaan==0){alert(msg);return false;} else {return true}return false;
}



function checkFormulier(){

var msg = "De volgende velden zijn leeg of niet juist ingevuld:\n";
var gaan = 1

if( trim(e("k1").value) ==""){msg = msg + "\n - E-mailadres";gaan = 0;}
if(trim(e("k2").value)==""){msg = msg + "\n - Naam";gaan = 0;}
if(trim(e("k3").value)==""){msg = msg + "\n - Adres";gaan = 0;}
if(trim(e("k4").value)==""){msg = msg + "\n - Postcode";gaan = 0;}
if(trim(e("k5").value)==""){msg = msg + "\n - Woonplaats";gaan = 0;}
if(trim(e("k6").value)==""){msg = msg + "\n - Telefoonnummer";gaan = 0;}
if(trim(e("k7").value)==""){msg = msg + "\n - Geboortedatum";gaan = 0;}
if(trim(e("k8").value) ==""){msg = msg + "\n - Geslacht";gaan = 0;}


if(gaan==0){alert(msg);return false;} else {return true}return false;

}
function img_v(val){
document.getElementById("img1").innerHTML = ""
document.getElementById("img2").innerHTML = ""
document.getElementById("img3").innerHTML = ""
gfhd = "img"+val;
document.getElementById(gfhd).innerHTML = " <img src='accept.gif' border=0>";
}


function lock2(k){
disabled = k;
document.getElementById("ond2").disabled = k;
document.getElementById("aantalantwoorden").disabled = k;
document.getElementById("antwoorden_div").innerHTML = ""
}

function lock1(k){
document.getElementById("ond1").disabled = k;
}

function lock3(k){
document.getElementById("ond4").disabled = k;
}


function sel(val){
img_v(val);

if(val==1){
lock3(true)
lock2(true)
lock1(false)
} else if(val==2){
lock3(true)
lock1(true)
lock2(false)
antwoorden(document.getElementById('aantalantwoorden').value)
} else if(val==3){
lock3(false)
lock1(true)
lock2(true)
}


}


function antwoorden(val){

document.getElementById("antwoorden_div").innerHTML = ""
var inh = ""


for(i=0;i<val;i++){
var ghh = "<span style='padding:3px'>" + (i+1)+ ". <input type='text' name='antwoord"+ i +"' class='invoer' size=35></span>";
if(inh == ""){
inh = ghh
} else {
inh = inh + "<br>" + ghh
}
}

document.getElementById("antwoorden_div").innerHTML = inh

}