function OpenComments (c) {
    window.open(c,
                    'comments',
                    'width=480,height=480,scrollbars=yes,status=yes');
}

function OpenTrackback (c) {
    window.open(c,
                    'trackback',
                    'width=480,height=480,scrollbars=yes,status=yes');
}

function install (aEvent,extName,iconURL)
{
    var params = new Array();
    params[extName] = { URL: aEvent.target.href,
               IconURL: iconURL,
               toString: function () { return this.URL; }
    };
    InstallTrigger.install(params);

    return false;
}


var agt=navigator.userAgent.toLowerCase();
var is_major = parseInt(navigator.appVersion);
var is_minor = parseFloat(navigator.appVersion);

var is_ie     = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));

var is_opera = (agt.indexOf("opera") != -1);