Bookmarklet to add a comment box at selection

gistfile1.txt

javascript: (function() {
    var d = document;
    var wrap = d.createElement('span');
    wrap.style.position = 'relative';
    wrap.className = 'wrap';
    var cmt = d.createElement('textarea');
    cmt.style.backgroundColor = 'yellow';
    cmt.style.top = '1.5em';
    cmt.style.position = 'absolute';
    cmt.style.zIndex = '99';
    cmt.className = 'cmt';
    cmt.style.height = '4em';
    cmt.style.width = '170px';
    if (window.getSelection) {
        var sel = window.getSelection();
        if (sel.rangeCount) {
            var rng = sel.getRangeAt(0).cloneRange();
            rng.surroundContents(wrap);
            sel.removeAllRanges();
            sel.addRange(rng);
            wrap.insertBefore(cmt, wrap.firstChild);
            cmt.thetext = rng;
            cmt.focus();
        }
    }
    return false;
})();