HTML5 Bookmarklet .. for more details > http://alaasdk.wordpress.com/2011/05/13/html5-speech-bookmarklet/

HTML5 Bookmarklet.js

(function(x) {
    var i, current;
    for (i in x) {
        current = x[i];
        if (current.type == "text") {
            current.setAttribute("x-webkit-speech", "x-webkit-speech"); current.setAttribute("speech", "speech");
        }
    }
})(document.getElementsByTagName("input"));