function checkForm()
{
	veld = document.form_warranty;
	fout = 0;

	if (veld.name.value == "") { fout++; }
	if (veld.address.value == "") { fout++; }
	if (veld.zip.value == "") { fout++; }
	if (veld.email.value == "") { fout++; }
	if (veld.modelboiler.value == "") { fout++; }
	if (veld.serialnumberboiler.value == "") { fout++; }
	if (veld.dateinstallationboiler.value == "") { fout++; }
	if (veld.nameinstaller.value == "") { fout++; }
	if (veld.registrationinstaller.value == "") { fout++; }
	
	if (fout > 0)
	{
		alert ('One or more required fields are not filled in.\nPlease fill in all the required fields and try again.');
		return false;
	}
	else
	{
		return true;
	}
	
}