function checkForm(formulier){
	if(formulier.name.value == "" || formulier.email.value == "" || formulier.comments.value == ""){
		  alert("Vul uw naam, email-adres en vraag of opmerking in")
		  return false;
	}		
	if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(formulier.email.value)){
		  return true
	}
	else {
   alert("Uw email-adres is niet geldig!")
   formulier.email.focus();
   return false
	}		
}
function showLocation() {
	window.open("http://maps.google.com/maps?q=Gerard+Doustraat+226,+1073+Amsterdam,+Amsterdam+(Noord-Holland),+Netherlands&sll=52.356561,4.899001&sspn=0.008151,0.023389&ie=UTF8&om=1&z=16&ll=52.357531,4.89825&spn=0.007509,0.018926&iwloc=addr","win", "height=700,width=800,status=yes,toolbar=yes,menubar=no,location=no,scrollbars=no,resizable=yes");
}