[PHP] mysql update help needed

[ROBERT MCPEAK]

Can somebody straighten this out for me?

I can't get the update to work.  I'm sure the variables are being
passed to the code.  Thanks!

if ($postaction==edit)
        
        {
                echo "it fired<Br>";
        // process form

                        $db = mysql_connect("myhost, "myuname",
"mypword");

                         mysql_select_db("mydb");

                        $sql = "UPDATE mytable SET
img_url=$img_url,visitdate=$visitdate,img_group=$img_group,display=$display,
caption=$caption where id = $id";

                        $result = mysql_query($sql);
                        
                        echo "<center>";
                        echo "Thank you! Information entered.\n";
                        echo "</center>";
        
        }

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