function externalLinks() { if (!document.getElementsByTagName) return; var anchors = document.getElementsByTagName("a"); for (var i=0; i0 && hoogte>0) { pop = window.open('', venster, 'width='+ breedte +',height='+ hoogte); pop.document.write(''); pop.document.write(''+ titel +''); pop.document.write(''); pop.document.write(''); pop.document.write(''); pop.document.write(''); pop.document.close(); } } function notBlank(str) { if (str != '') { for (i = 0; i < str.length; i++) { if (str.charAt(i) != " ") return true } } return false } function checkReactieForm(formulier) { if (!notBlank(formulier.naam.value) || !notBlank(formulier.bericht.value)) { alert('Naam en bericht zijn verplicht'); return false; } else { return true; } }