function showPDF($type)
    {
        $output = '';
      $strSQL = 'SELECT customer_name, course_name, booking_date, booking_time
             FROM booking

             INNER JOIN customer
             ON booking.customer_id = customer.customer_id

             INNER JOIN course
             ON booking.course_id = course.course_id';

        $objQuery = mysql_query($strSQL)or die(mysql_error());
            global $strSQL;
            $i=0;
            $a=0;
            while($objResult = mysql_fetch_array($objQuery)){
                $i++;
                $a++;
                if($i%2==0)
                {
                $bg = "#F5F5F5";
                }
                else
                {
                $bg = "#FFFFFF";
                }
            $output .='
                        <tr  bgcolor="'.$bg.'" >
                            <td width="7%"><div align="center">'.$a.'</div></td>
                            <td width="8%"><div align="left">'.$objResult['customer_name'].'</div></td>
                            <td width="13%"><div align="left">'.$objResult['course_name'].'</div></td>
                            <td width="13%"><div align="left">'.$objResult['booking_date'].'</div></td>
                            <td width="22%"><div align="left">'.$objResult['booking_time'].'</div></td>
                        </tr>
                    ';
            }
            return $output;
    }

    if(isset($_POST["create_pdf"]))
    {
        require_once('tcpdf/tcpdf.php');
        require_once('call/pdfP.php');
        $obj_pdf->SetTitle("#");

        $content .= '
                    <table border="1" cellpadding="3" cellspacing="0" width="100%">
                        <thead>
                            <tr bgcolor="#D3D3D3" color="Black">
                                <th width="7%"><div align="center"><B>Customer name</B></div></th>
                                <th width="8%"><div align="left"><B>Course name</B></div></th>
                                <th width="13%"><div align="left"><B>Booking date</B></div></th>
                                <th width="13%"><div align="left"><B>Booking time</B></div></th>
                            </tr>
                        </thead>
                    ';
        $content .= showPDF('pdf');
        $content .= '</table>';
        $content .= $_SESSION['ss_set_pdf'] ;
        $obj_pdf->writeHTML($content);
        ob_end_clean();
        $obj_pdf->Output('vender.pdf', 'I');
    }