function check_size () {

	<!--- kleine hack om de lengte van de pagina goed te krijgen -->

	if (document.getElementById('content').scrollHeight < document.getElementById('linker-content').scrollHeight) {
		document.getElementById('content').style.minHeight = (document.getElementById('linker-content').scrollHeight + 20 ) + 'px';
	} else {
		document.getElementById('content').style.minHeight = (document.getElementById('content').scrollHeight + 20 ) + 'px';
	}

}

function validate(string) {
   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
   var address = string;
   if(reg.test(address) == false) {
      return false;
   } else {
	return true;
   }
}


function meld_aan () {

	var error = false;

	//Checken of de naam is ingevuld
	if (document.getElementById('addemail').value == "") {
		error=true;
	}
	
	//Checken of er wel een geldig mailadres is ingevuld
	if (!validate(document.getElementById('email').value)) {
		error=true;
	}

	if (error == true) {
		document.getElementById('nieuwsbrief-error').innerHTML = 'Niet alle velden zijn correct ingevuld!<br>';
	} else {
		$('#nieuwsbrief-error').load('ajax_callback.php?email=' + document.getElementById('email').value + '&naam=' + document.getElementById('addemail').value + '&groupselect=' + document.getElementById('groupselect').value);
	}


}

function meld_aan_eng () {
	var error = false;

	//Checken of de naam is ingevuld
	if (document.getElementById('addemail').value == "") {
		error=true;
	}
	
	//Checken of er wel een geldig mailadres is ingevuld
	if (!validate(document.getElementById('email').value)) {
		error=true;
	}

	if (error == true) {
		document.getElementById('nieuwsbrief-error').innerHTML = 'Please fill in all field!<br>';
	} else {
		$('#nieuwsbrief-error').load('ajax_callback.php?email=' + document.getElementById('email').value + '&naam=' + document.getElementById('addemail').value + '&groupselect=' + document.getElementById('groupselect').value);
	}


}