Gmail message-ID / permalink finder

gmail_mid.js

javascript:(function () {
gmonkey.load("1.0", function (gmail) {
    if (gmail.getActiveViewType() !== "cv") {
        alert("You need to be in a conversation view for this to work.");
        return;
    }
    var xhr = new XMLHttpRequest();

    var uri = "?ui=2&ik=" + GLOBALS[9] + "&view=om&th=" + document.location.hash.split("/").reverse()[0];

    xhr.onreadystatechange = function () {
        if ( xhr.readyState == 4 && xhr.status == 200 ) {
            var lines = xhr.responseText.split("\n");
            for ( var i = 0; i < lines.length; i++ ) {
                if ( lines[i].indexOf("Message-ID:") == 0 ) {
                    msgid = lines[i].split(' ')[1];
                    document.location.hash = "#search/rfc822msgid:" + msgid;
                    break;
                }
            }
        }
    };
    xhr.open("GET", uri);
    xhr.send();
});
}());