function externalLinks() {
    if (!document.getElementsByTagName) return;
    var anchors = document.getElementsByTagName("a");
    for (var i = 0; i < anchors.length; i++) {
        var anchor = anchors[i];
        if (anchor.getAttribute("href") &&
       anchor.getAttribute("rel") == "external")
            anchor.target = "_blank";
    }
}
window.onload = externalLinks;

/**
* Returns a random number between min and max
*/
function getRandomArbitary(min, max) {
    return Math.random() * (max - min) + min;
}

/**
* Returns a random integer between min and max
* Using Math.round() will give you a non-uniform distribution!
*/
function getRandomInt(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}