jak sprawić, by zawartość tabeli wyświetlała się automatycznie w formie pop-up

tak, uważam, że

<script>
        function setvalue(values) {
        document.getElementById('posisi').value = values;
    }
    </script>
    <div>
        <table width="1023" height="248" border="1">
            <tr>
                <td>

                        <input type="button" onclick="setvalue(this.value);" value="A1.8" />
                </td>
            </tr>
        </table>
        </div>
        <div class="popup_window_css" id="sample">
            <table class="popup_window_css">
                <tr class="popup_window_css">
                    <td class="popup_window_css">
                        <div class="popup_window_css_head">
                            <img src="images/close.gif" alt="" width="9" height="9" />Aksi</div>
                        <div class="popup_window_css_body">
                            <div style="border: 1px solid #808080; padding: 6px; background: #FFFFFF;">
                                <form method="post" action="">
                                    <table>
                                        <tr>
                                            <td>Werehouse</td>
                                            <tr>
                                                <td>Posisi</td>
                                                <td>
                                                    <input type='text' name="p" id="posisi" />
                                                </td>
                                            </tr>
                                            <tr>
                                                <td>Product ID</td>
                                                <td>
                                                    <input type='text' name="id" />
                                                </td>
                                            </tr>
                                            <tr>
                                                <td>Product Name</td>
                                                <td>
                                                    <input type='text' name="nama" />
                                                </td>
                                            </tr>
                                            <tr>
                                                <td>Production Date</td>
                                                <td>
                                                    <input type='text' name="tgl" />
                                                </td>
                                            </tr>
                                            <tr>
                                                <td colspan='2' align='right'>
                                                    <input type='submit' value='Save'>
                                                    <input type='reset' value='Reset' />
                                                    <input type='button' value='view' onclick=\ "window.location.href='#';\"/>
                                                </td>
                                            </tr>
                                    </table>
                            </div>
                        </div>

możesz sprawdzić tutaj http://jsfiddle.net/JLExZ/