function checkForm(form){
	err = "Het formulier is niet geheel ingevuld. De ontbrekende verplichte velden zijn:\n\n"
	
	if(form.looptijd.value=="")
	  err += "- Looptijd\n"
	if(form.bedrijf.value=="")
	  err += "- Bedrijfsnaam\n"	
	if(form.naam.value=="")
	  err += "- Contactpersoon\n"
	if(form.adres.value=="")
	  err += "- Adres\n"
	if(form.postcode.value=="")
	  err += "- Postcode\n"
	if(form.plaats.value=="")
	  err += "- Woonplaats\n"
	if(form.telefoon.value=="")
	  err += "- Telefoon\n"
	if(form.email.value=="")
	  err += "- Email\n"

	
	err += "\nWilt u deze velden wel invullen!\n"
	
	if (form.captcha_code.value!="57241") {
		alert("De ingevoerde anti-spam code is niet correct!");
		return false;
	}
	
	if((form.looptijd.value=="")||
	   (form.bedrijf.value=="")||
		 (form.naam.value=="")||
		 (form.adres.value=="")||
		 (form.postcode.value=="")||
		 (form.plaats.value=="")||
		 (form.telefoon.value=="")||
		 (form.email.value=="")
		){
	  alert(err)
	  return false;
	}else{
	  return true;
	}
}

function showLayer(id){
	
	if (id == "bedrijf"){
	document.getElementById('perscalc').style.display = "none";
	document.getElementById('bedrijfscalc').style.display = "block";
}else{
	document.getElementById('perscalc').style.display = "block";
	document.getElementById('bedrijfscalc').style.display = "none";
}
}	

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