Topic: please help me

hi, i'm a beginner programmer,
somebody please help me to find out where is the problem,
why it can't start to browse nor to upload when i pressed the buttons?


<html>

    <head>

    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />

    <title>User Signup</title>

        <link href="/css/phpMM.css" rel="stylesheet" type="text/css" />

        <link href="/css/menu.css" rel="stylesheet" type="text/css" />   

        <link type="text/css" href="css/smoothness/jquery-ui-1.8.21.custom.css" rel="stylesheet" />

        <link href="/css/jquery.validate.password.css" rel="stylesheet" type="text/css" />



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

        <script type="text/javascript" src="/js/jquery.validate.js"></script>

        <script type="text/javascript" src="/js/jquery.validate.password.js"></script>

        <script type="text/javascript" src="js/jquery-ui-1.8.21.custom.min.js"></script>

        <script type="text/javascript" src="js/plupload.full.js"></script>

        <script type='text/javascript'>
   

//<![CDATA[



    var uploader = new plupload.Uploader({

        runtimes: 'flash',

        flash_swf_url: 'js/plupload.flash.swf',

        browse_button: 'pickfiles',

        container: 'uploader',

        url: 'upload.php'

    });

   

    uploader.init();

   

    document.getElementById('uploadfiles').onclick = function() {

        uploader.start();

    };







$(document).ready(function() {

    // validate signup form on keyup and submit

    var validator = $("#signupform").validate( {

        rules: {

            first_name: {

                required: true,

                minlength: 2,

                maxlength: 20

            },

            last_name: {

                required: true,

                minlength: 2,

                maxlength: 30

            },

            username: {

                required: true,

                minlength: 2,

                maxlength: 30

            },

            password: {

                required: true,

                minlength: 6,

                maxlength: 20

            },

            confirm_password: {

                required: true,

                equalTo: "#password"

            },

            email: {

                required: true,

                maxlength: 30

            },

            facebook_url: {

                required: false,

                maxlength: 30

            },

            twitter_handle: {

                required: false,

                maxlength: 20

            },

            user_pic: {

                required: false

            },

            bio: {

                required: false

            },

        },

        messages: {

            first_name: {

                required: "Enter your first name",

                minlength: "Enter at least 2 characters"

            },

            last_name: {

                required: "Enter your last name",

                minlength: "Enter at least 2 characters"

            },

            username: {

                required: "Enter your username",

                minlength: "Enter at least 2 characters"

            },

            confirm_password: {

                required: "Repeat your password",

                equalTo: "Enter the same password as above"

            },

            email: {

                required: "Enter your e-mail address"

            },

        },

        // the errorPlacement has to take the table layout into account

        errorPlacement: function(error, element) {

            error.prependTo(element.parent().next() );

        },

        // set this class to error-labels to indicate valid fields

        success: function(label) {

            label.html("&nbsp;").addClass("checked");

        }

    });

   

    // propose username by combining first- and lastname

    $("#username").focus(function() {

        var firstname = $("#first_name").val();

        var lastname = $("#last_name").val();

        if(firstname && lastname && !this.value) {

            this.value = firstname + "." + lastname;

        }

    });

});



//]]>
        </script>

    </head>
    <body>

    <div id="wrapper">

        <div id="header"><h1>DIGITAL JOCKEY CLUB</h1>

        </div>

        <div id='messages'>
        </div>

        <!--display main navigator-->

        <ul id="main_nav">

            <li><a href="index.php" class="link_nav">HOME PAGE</a></li>
        </ul>


    <div id="content">

        <h1>Join Digital Jockey Club</hi>

        <p>Please enter your online connections below:</p>

        <form action="create_user.php" method="POST" id="signupform" enctype="multipart/form-data">

        <table class="signupform">

        <tr>

        <td class="label"><label for="first_name">First Name:</label></td>

        <td class="field"><input type="text" id="first_name" name="first_name" size="40"/></td>

        <td class="status"> </td>

        </tr>

        <tr>

        <td class="label"><label for="last_name">Last Name:</label></td>

        <td class="field"><input type="text" id="last_name" name="last_name" size="40"/></td>

        <td class="status"> </td>

        </tr>

        <tr>

        <td class="label"><label for="username" id="lusername">Username:</label></td>

        <td class="field"><input type="text" id="username" name="username" size="40"/></td>

        <td class="status"> </td>

        </tr>

        <tr>

        <td class="label"><label for="password">Password:</label></td>

        <td class="field"><input type="password" id="password" name="password" size="40"/></td>

        <td class="status">

          <div class="password-meter">

            <div class="password-meter-message">&nbsp;</div>

              <div class="password-meter-bg">

                <div class="password-meter-bar"></div>

              </div>

          </div>

        </td>

        </tr>

        <tr>

        <td class="label"><label for="confirm_password">Confirm Password:</label></td>

        <td class="field"><input type="password" id="confirm_password" name="confirm_password" size="40"/></td>

        <td class="status"> </td>

        </tr>

        <tr>

        <td class="label"><label for="email">E-Mail Address:</label></td>

        <td class="field"><input type="text" id="email" class="email" name="email" size="40"/></td>

        <td class="status"> </td>

        </tr>

        <tr>

        <td class="label"><label for="facebook_url">Facebook URL:</label></td>

        <td class="field"><input type="text" id="facebook_url" name="facebook_url" size="40"/></td>

        <td class="status"> </td>

        </tr>

        <tr>

        <td class="label"><label for="twitter_handle">Twitter Handle:</label></td>

        <td class="field"><input type="text" id="twitter_handle" name="twitter_handle" size="40"/></td>

        <td class="status"> </td>

        </tr>

        <tr>

        <td class="label"><input type="hidden" name="MAX_FILE_SIZE" value="2000000" />

        <label for="user_pic">Upload a picture:</label></td>

        <td class="field"><input type="file" id="user_pic" name="user_pic" size="20"/></td>

        </tr>

        <tr>

        <td class="label"><label for="bio">Bio:</label></td>

        <td class="field"><textarea id="bio" name="bio" cols="32" rows="10"></textarea></td>

        </tr>

        <table>

        <tr>

        <div class="center">

            <input type="submit" value="Join the Club" />

            <input type="reset" value="Clear and Restart" />

        </div>

        </tr>

        </table>

        </form> 

      

        <div id="uploader">

            <p>Upload Files:</p>

   

            <a id="pickfiles" href="javascript:;">Add Files</a>

            <a id="uploadfiles" href="javascript:;">Start Upload</a>

        </div>



    </div>



    <div id="footer"></div>

  </div>

  </body>

 

</html>