// -----------------------------------------------------------------------------

if (document.images) {
  a0 = new Image(156,18); a0.src = "grafx/menu_jongeneel.gif";
  a1 = new Image(156,18); a1.src = "grafx/menu_jongeneel_uber.gif";

  b0 = new Image(156,18); b0.src = "grafx/menu_aktivitaten.gif";
  b1 = new Image(156,18); b1.src = "grafx/menu_aktivitaten_uber.gif";

  c0 = new Image(156,18); c0.src = "grafx/menu_auftraggeber.gif";
  c1 = new Image(156,18); c1.src = "grafx/menu_auftraggeber_uber.gif";

  d0 = new Image(156,18); d0.src = "grafx/menu_fuhrpark.gif";
  d1 = new Image(156,18); d1.src = "grafx/menu_fuhrpark_uber.gif";

  e0 = new Image(156,18); e0.src = "grafx/menu_stelle.gif";
  e1 = new Image(156,18); e1.src = "grafx/menu_stelle_uber.gif";

  f0 = new Image(156,18); f0.src = "grafx/menu_kontakt.gif";
  f1 = new Image(156,18); f1.src = "grafx/menu_kontakt_uber.gif";

  g0 = new Image(156,18); g0.src = "grafx/menu_homepage.gif";
  g1 = new Image(156,18); g1.src = "grafx/menu_homepage_uber.gif";

  x0 = new Image(65,65); x0.src = "grafx/picto_alg_gr.gif";
  x1 = new Image(65,65); x1.src = "grafx/picto_alg_grwit.gif";

  y0 = new Image(65,66); y0.src = "grafx/picto_gevaar_gr.gif";
  y1 = new Image(65,66); y1.src = "grafx/picto_gevaar_grwit.gif";

  z0 = new Image(65,66); z0.src = "grafx/picto_food_gr.gif";
  z1 = new Image(65,66); z1.src = "grafx/picto_food_grwit.gif";
}

// -----------------------------------------------------------------------------

function change(imageName,imageFile) {
  if (!document.images) return;
  document.images[imageName].src = eval(imageFile + ".src");
}

// -----------------------------------------------------------------------------

function checkContact() {

  var f = document.contactForm;

  if (f.naam.value.length < 2) {
    alert('Vul a.u.b. uw naam in!');
    return false
  }

  if (f.mail.value == '') {
    alert('Vul a.u.b. uw e-mailadres in!');
    return false
  }

  if (isEmail(f.mail.value) != true) {
    alert('Vul a.u.b. een geldig e-mailadres in!');
    return false
  }

  return true
}

// -----------------------------------------------------------------------------

function isEmail(str) {
  // are regular expressions supported?
  var supported = 0;
  if (window.RegExp) {
    var tempStr = "a";
    var tempReg = new RegExp(tempStr);
    if (tempReg.test(tempStr)) supported = 1;
  }
  if (!supported) 
    return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
  var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
  var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
  return (!r1.test(str) && r2.test(str));
}

// -----------------------------------------------------------------------------


// -----------------------------------------------------------------------------

var extraVelden;
extraVelden = '';

function checkForm(strElements) {

  var result;
  result = false;
		
	if (extraVelden != '') {
		strElements += extraVelden;
	}

	elements = strElements.split(',');
	strerror = '';

  for (x = 0; x < elements.length; x++) {	

    if (elements[x].indexOf('CB') >= 0) {	
      elements[x] = elements[x].replace('CB:','');
      if (document.getElementById(elements[x]).checked == false) {
        strerror += ('Het vak \''+elements[x]+'\' moet aangekruisd zijn\n');
        result = false;
      }
    } else {
      if (document.getElementById(elements[x]).value == '') {	
        if (elements[x].indexOf('_') > 0) {
          elements[x] = elements[x].substring(elements[x].indexOf('_')+1, elements[x].length);
        }
        strerror += ('Het veld \''+elements[x]+'\' mag niet leeg zijn\n');
        result = false;
      }
    }
  }

  if (document.getElementById('cv').value != '') {
    var cvfile = isCorrectFile(document.getElementById('cv').value);
    if (cvfile == false) {
      strerror += 'Het CV is in een ongeldig bestandsformaat!\n(toegestaan; .txt, .doc, .pdf)';
      result = false;
    }
  }

  if (strerror != '') {
    alert(strerror);
  } else {
    result = true;
  }
  return result;
}

// -----------------------------------------------------------------------------

function isCorrectFile(fileLoc) {

  var file = fileLoc;
  var pos  = file.lastIndexOf(".");
  var ext;

  if (pos >= 0) {
    ext = file.substr(pos + 1);
    ext = ext.toLowerCase();
    if ((ext == 'txt') || (ext == 'pdf') || (ext == 'doc')) {
      return true
    } else {
      return false
    }
  } else {
    return false
  }
}

// -----------------------------------------------------------------------------