function updateLanguageSwitch(topic, sub_topic) {
switchLanguageAnchor = parent['banner'].document.getElementById('switch_language');
newLanguage = switchLanguageAnchor.hreflang;
parent['banner'].document.getElementById('switch_language').href = './index.php?lang=' + newLanguage + '&topic=' + topic + '&sub_topic=' + sub_topic;
}
function selectTopic(topic, sub_topic) {
parent['nav'].location.href = 'nav.php?topic=' + topic + '&sub_topic=' + sub_topic;
updateLanguageSwitch(topic, sub_topic);
}
function setNavigation(topic, sub_topic) {
parent['nav'].location.href = '../../nav.php?topic=' + topic + '&sub_topic=' + sub_topic;
updateLanguageSwitch(topic, sub_topic);
}
function showImage(aImage, aCaption) {
html = "" + aCaption + "" +
"" +
"![](" + aImage + ")
" +
"";
popup = window.open('','Image','toolbar=0,location=0,directories=0,menuBar=0,scrollbars=0,resizable=1');
popup.document.open();
popup.document.write(html);
popup.document.close();
popup.focus();
}