I am not able to use the opacity property in Firefox, opera , safari, or chrome

I am not able to use the opacity property in Firefox, opera , safari, or chrome

when I run the example below the opacity only changes in IE. I have javaScript enabled in all my other browsers is the something else I could be doing wrong?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Click the Button to Animate different properties</title>

    <script src="jquery-1.3.2.min.js" type="text/javascript"></script>

    <script src="jquery-1.3.2-vsdoc2.js" type="text/javascript"></script>

    <script language="javascript" type="text/javascript">
      
   
    </script>

    <style type="text/css">
        #block
        {
            background-color: #bca;
            width: 100px;
            border: 1px solid green;
        }
    </style>
</head>
<body>
    <button id="go">
        &raquo; Run</button>
    <br />
    <div id="block">
        Hello!</div>

    <script language="javascript" type="text/javascript">

        // Using multiple unit types within one animation.
        $("#go").click(function()
        {
            $("#block").animate({
                width: "70%",
                opacity: 0.1,
                marginLeft: "0.6in",
                fontSize: "3em",
                borderWidth: "10px"
            }, 1500);
        });
    </script>

   
</body>
</html>