function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
   var anchor = anchors[i];
   if (anchor.getAttribute("href") &&
       anchor.getAttribute("rel") == "external")
     anchor.target = "_blank";
 }
}
window.onload = externalLinks;

function toggleComments()
	{
		obj = document.getElementById('comments');
		obj2 = document.getElementById('comment_balloon');
		if (obj.style.display == "none") obj.style.display = "inline-block";
		else obj.style.display = "none";
		obj2.style.display = "none";
	}
	
function checkform ( form )
{
  // ** START **
if (form.name.value == "") {
    alert( "Gaarne een naam invullen." );
    form.email.focus();
    return false ;
  }

if (form.name.value == "Vul hier je naam in*") {
    alert( "Gaarne een naam invullen." );
    form.email.focus();
    return false ;
  }

if (form.textfield.value == "") {
    alert( "Vergeet je vraag of opmerking niet te vermelden." );
    form.email.focus();
    return false ;
  } 
  // ** END **
  return true ;
}

var emailfilter=/^\w+[\+\.\w-]*@([\w-]+\.)*\w+[\w-]*\.([a-z]{2,4}|\d+)$/i

function checkmail(e){
var returnval=emailfilter.test(e.value)
if (returnval==false){
alert("Gaarne een bestaand e-mail adres invullen.")
e.select()
}
return returnval
}