function quickLinks() {
    var quick  = document.getElementById("quick");
    var newURL = quick.options[quick.selectedIndex].value;
    if (newURL) {
        window.open(newURL, "_self");
    }
}

function externalLinks() {
    var anchors, i, anchor, rel;
    if (!document.getElementsByTagName) {
        return;
    }
    anchors = document.getElementsByTagName("a");
    for (i = 0; i < anchors.length; i++) {
        anchor = anchors[i];
        rel = anchor.getAttribute("rel");
        if (anchor.getAttribute("href") &&
            rel === "external" || rel === "pdf" || rel === "related") {
            anchor.target = "_blank";
            anchor.title = "opens in a new window";
        }
    }
}

function open_gas_major_popup() {
    var element = document.getElementById("gas_major");

    if (element.style.display === "none") {
        element.style.display = "block";
    } else {
        element.style.display = "none";
    }

    return false;
}

function close_gas_major_popup() {
    var element = document.getElementById("gas_major");
    element.style.display = "none";

    return false;
}

window.onload = externalLinks;

/**
 * Opens the URL selected in the HTMLSelectElement with id="select_a_site"
 */
function selectASite() {
    var element  = document.getElementById("select_a_site");
    var newURL = element.options[element.selectedIndex].value;
    if (newURL) {
        window.open(newURL, "_parent");
    }
}