function ExtractHost(url) {
    var returnArry = /^(?:[^:\/?#]+):\/\/([^\/?#]+)(?::\d+)?(?:[^?#]*)\//i.exec(url);
    if (returnArry && typeof returnArry === "object") {
        return returnArry[1];
    } else {
        return "";
    }
}

function BustFrame() {
    var blacklist = ['digg.com'];
    if (top.location != window.location) {
        var topURL = ExtractHost(document.referrer);
        if (topURL) {
            for (var i = 0; i < blacklist.length; i++) {
                if (topURL.indexOf(blacklist[i]) != -1) {
                    top.location.replace(window.location);
                    return;
                }
            }
        }
    }
}

BustFrame();