window.onload = init;

function init() {
    externalLinks_init();
}

function externalLinks_init() {
    if (!document.getElementsByTagName) {
        return;
    }

    var links = document.getElementsByTagName('a');

    for (var i=0; i<links.length; i++) {
        var link = links[i];

        if (link.getAttribute('href') && link.getAttributeNode('class') && (link.getAttributeNode('class').value.search(/external/) >= 0)) {
            link.onclick = externalLinks_open;
            link.onkeypress = externalLinks_open;
        }
    }
}

function externalLinks_open(a) {
    window.open(this.href);
    return false;
}