function check(which,verplicht,error,emailerror){var empty=false;var confirmconditionsempty=false;for(i=0;i<which.length;i++){var veld=which.elements[i];if(veld.type=="text"){veld.style.background="#FFFFFF";}
for(j=0;j<verplicht.length;j++){if(veld.type=="text"&&veld.name==verplicht[j][0]&&veld.value==''){veld.style.background="#FFBB99";empty=true;}
if(veld.type=="textarea"&&veld.name==verplicht[j][0]&&veld.value==''){veld.style.background="#FFBB99";empty=true;}
if(veld.type=="checkbox"&&!veld.checked&&veld.name=='voorwaarden'){veld.style.background="#FFBB99";confirmconditionsempty=true;}
if(veld.type=="text"&&veld.value!=''&&veld.name=='postcode'&&verplicht[j][1]=='postcode'){postcode=veld.value.toUpperCase();veld.value=postcode;rExp=/^[1-8]{1}[0-9]{3}[A-Z]{2}$/;if(!rExp.exec(postcode)){alert('U heeft het veld postcode niet juist ingevuld.\nVul de postcode in met notatie 1234AB');return false;}}
if(veld.type=="text"&&veld.value!=''&&veld.name=='email'&&verplicht[j][1]=='email'){var email2=document.getElementById("email2");if(email2!=undefined&&which.name!='login2'&&which.name!='login'){if(veld.value!=email2.value){veld.style.background="#FF818C";alert("E-mail adressen komen niet overeen");return false;}}
var email=/^[_\.0-9a-z-]+\@([0-9a-z][0-9a-z-]*\.)+([a-z]{2,4})+$/i
if(!(email.test(veld.value))){veld.style.background="#FF818C";alert("Geen geldig emailadres");return false;}}}}
if(empty){alert("Niet alle velden zijn ingevuld..");return false;}else if(confirmconditionsempty){veld.style.background="#FFBB99";alert("U bent nog niet akkoord gegaan met de Algemene Voorwaarden");return false;}else{document.getElementById("spamcheck").value="Geen SPAM";return true;}}
function able(id){oldstyle=document.getElementById(id).style.display;document.getElementById('sponsoring').style.display='none';document.getElementById('destarter').style.display='none';document.getElementById('demanager').style.display='none';document.getElementById('deondernemer').style.display='none';if(oldstyle=='none'){document.getElementById(id).style.display='block';}else{document.getElementById(id).style.display='none';}}