Trying to put conditional statements in eachother..not working

The code inside "if(ISSET($_GET['del']))" isn't printing out, but if I remove the "if(ISSET($_GET['del']))" condition the form prints out. but if I remove the "if(ISSET($_GET['del']))" condition the form prints out.

       if(ISSET($myrow))
     {
        @$n = $_GET['id'];

        $myrow['firstname'];
        $myrow['lastname'];
        $myrow['id'];

            if(ISSET($_GET['del']))
            {

                ?>

                <table class="form">

                 <form method="get">

                <tr>
                <td> Your Firstname: </td>

 <td> <input type="text" value="<?php echo $myrow['firstname']; ?>"> </td>

                </tr>

                <br>

                <tr>
                <td> Your Lastname: </td> 

<td> <input type="text" value="<?php echo $myrow['lastname']; ?>"> </td>

                </tr>
               </table>

                <br> <br>
<input type="submit" value="Delete" name="delete" class="delete">

                <input type="submit" value="Edit" name="delete">
             
                </form> 
                <?php
            }                
         }
 
   <form method="get">
   <input type="submit" value="Delete" name="del">
   </form>