// JavaScript Document
function LaunchContactForm ()
{
    var win = "width=400,height=350,left=200,top=100,copyhistory=no,directories=no,menubar=no,location=no,resizable=no,scrollbars=no";
    window.open("contact.php",'contact',win);
    return false;
}
var maximumLength = 500;

function checkLength(control, maximum) {
  var length = control.value.length;

  if (length > maximum) {
    alert('Let op, maximum aantal tekens is ' + maximumLength
        + '. Op dit moment zijn het ' + length + ' tekens.');
    return false;
  }
  return true;
}

function validate(form) {
  var controls = form.elements;

  if (!checkLength(controls.textArea, maximumLength))
    return false;

  return true;
}