Sort Drop down menu to display selected item first?

[nashsaint]

I have a drop-down menu populated from sql query.  After the user selected something, he can come back anytime in this page to change whatever he wants from the drop-down list.  How can I configure the script so that when the user comes back to this page, php will pull out the entry that the user first selected and display it as the first option under the list? 

[nashsaint]

This is my code:

 

                    $sql = "SELECT * FROM job_log_pull";
                    $res = mysql_query($sql);

                    if(mysql_num_rows($res) > 0){
                        echo("<select name=\"make\">");
                            while($row = mysql_fetch_object($res)){
                                echo("<option value=\"$row->make_id\">$row->pc</option>");
                            }
                            echo("</select>");
                    }
                    else
                    {
                    echo("<i>No values found.</i>");
                    }

[hansford]

you'll have to start a session and then hold the value selected in a session variable like so  $_SESSION['selection'] = "users selection";