/* Scan all links in the document and set classes on them if
 * they point outside the site, or are special protocols
 * To disable this effect for links on a one-by-one-basis,
 * give them a class of 'link-plain'
 */
function getContentArea() {
    return document.getElementById('content');
}

function scanforlinks() {
    contentarea = getContentArea();
    if (!contentarea) return false;

    links = contentarea.getElementsByTagName('a');
    for (i=0; i < links.length; i++) {
        if ( (links[i].getAttribute('href'))
             && (links[i].className.indexOf('link-plain')==-1) ) {
            var linkval = links[i].getAttribute('href');

            // check if the link href is a relative link, or an absolute link to the current host.
            if (linkval.toLowerCase().indexOf(window.location.protocol + '//' + window.location.host)==0) {
                // absolute link internal to our host - do nothing
            } else if (linkval.indexOf('http:') != 0) {
                // not a http-link. Possibly an internal relative link, but also
                // possibly a mailto or other protocol add tests for relevant protocols as you like.
                protocols = ['mailto', 'ftp', 'news', 'irc', 'h323', 'sip', 'callto', 'https', 'feed', 'webcal'];
                // h323, sip and callto are internet telephony VoIP protocols
                for (p=0; p < protocols.length; p++) {
                    if (linkval.indexOf(protocols[p]+':') == 0) {
                        // if the link matches one of the listed protocols, add className = link-protocol
                        wrapNode(links[i], 'span', 'link-'+protocols[p]);
                        break;
                    }
                }
            } else {
                // we are in here if the link points to somewhere else than our
                // site.
                if ( links[i].getElementsByTagName('img').length == 0 ) {
                    // we do not want to mess with those links that already have
                    // images in them
                    wrapNode(links[i], 'span', 'link-external');
                }
                // set open_links_in_external_window in plone_javascript_variables.js.pt
                // to true if you want external links to be opened in a new
                // window.
                if ((typeof external_links_open_new_window != 'undefined') &&
                    (external_links_open_new_window == true)) {
                    links[i].setAttribute('target', '_blank');
                }
            }
        }
    }
};

$(document).ready(function() {
    scanforlinks();
});