function checkForm(formName) {
	var myForm = document.forms[formName];
	var verplicht = new Array("aantal","aanhef","voornaam","achternaam","postadres","postcode","plaats","telefoon","email","onderwerp");
	
	for(i=0; i<myForm.length; i++){	
		for(vi=0; vi<verplicht.length; vi++){
			if(myForm[i].name == verplicht[vi]){
				if(myForm[i].value == ''){
					alert("Je bent vergeten het veld "+myForm[i].name+" vergeten in te vullen!");
					myForm[i].focus();
					return false;				
				} else if(myForm[i].name == 'email'){
					checkEmail(myForm[i].value);
				}
			} 
		}
	}
	
	return true;
}

function checkEmail(str){
	var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
	if (filter.test(str))
		return true;
	else{
		alert(str+" is geen geldig e-mail adres!")
		return false;
	}
}

function VH()
{
		if (!document.getElementById('hum_c')) {
			var ei = document.createElement('INPUT');
			var sd = 'hu' + 'm_c';
			ei.id = sd;
			ei.type = 'hidden';
			ei.name = 'hum';
			ei.value = '1';
			document.getElementById('frm').insertBefore(ei, document.getElementById('frm').childNodes[0]);
		}
}