// First, get the array of meta-tag elements

    metatags = document.getElementsByTagName("meta");



    // Iterate through the array, listing them all

    // Update only the Title meta tag

    for (cnt = 0; cnt 
    {

        var name = metatags[cnt].getAttribute("name");

        var content = metatags[cnt].getAttribute("content");



        // List the original meta tag name=content

        document.write(name + " = " + content + "
");



        // Update the Title meta tag

        if (metatags[cnt].getAttribute("name") == "Title")

              metatags[cnt].setAttribute("content", "Better document title");



    }