I am trying to pass a php value, obtained from a join query, to a javascript function. The javascript function will open a new window and show some data based on the passed value.My query works fine but the php value is not passed to the JS function.

My code :

<script type=text/javascript>



   function product(var) {

    window.open( view_product_info.php?var, myWindow, 

    status = 1, height = 300, width = 300, resizable = 0 )

    }

 </script>



\ the line where i am trying to pass the php varibale



 echo '<td align=center ><a href=javascript:product('.$product_id.');> <br/> '.$row['product_name'].'</a></td>';

why the php value $product_id is not passed to the product function.

Thanks in advance.

The code:

     <script type=text/javascript>

       <!--

    function product(var) {

    window.open( view_product_info.php?id, myWindow, 

     status = 1, height = 300, width = 300, resizable = 0 )

      }

     function company() {

       window.open( index.php, myWindow, 

        status = 1, height = 300, width = 300, resizable = 0 )

   }

     function category() {

        window.open( index.php, myWindow, 

     status = 1, height = 300, width = 300, resizable = 0 )

 }

//-->

      <?php include(includes/header.php); 





       $search = $_POST['search'];

       $sql= my query1..;



       $sql2= my query2;



       $result=mysql_query($sql);

       $result2=mysql_query($sql2);

     if($result) {

            echo '<center>';

    echo '<table cellpadding=0 cellspacing=0 border=1 width=100%>';

    echo '<tr><th>Sr No.</th><th>Product Name</th><th>Company      Name</th>         <th>Category</th></tr>';

               $number=1;

                 while ($row = mysql_fetch_array($result)){

                $row2 = mysql_fetch_array($result2);

                echo $product_id=$row2[product_id];



       echo '<tr> ';

        echo '<td align=center >'.$number.'</td>';





                     echo '<td align=center ><a href=javascript:product('<?= $product_id?>')> 

''';

            echo '<td align=center><a href=javascript:company() ><br/>  '.$row['company_name'].'</td>';

echo '<td align=center><a href=javascript:category() ><br/>  '.$row['category_name'].'</td>';



   $number=$number+1;



          }echo '</tr>';

     echo'</table>';

          echo'</center>'; 



}

         else {

       echo No data found;

    //echo mysql_error();



       }

       }

      }

     ?>