checked checkbox

[dvwhi]

hi i need help i want it to do once you have checked 3 check boxes the submit buttinon appears and it will be all on one page i think this might work but donno =

<?
if(isset($_POST['q1'])) $q1="set";
if(isset($_POST['q2'])) $q2="set";
if(isset($_POST['q3'])) $q3="set";
if($q1 != '' && $q2 != '' && $q3 != ''){
echo'<input type="submit" name="submit" value="Continue" />';}
else{
echo"Please Check All Boxes";}

?>

can you tel me wots ronge

[djjjozsi]

<?php
session_start();
if ( isset( $_POST['q1'] ) AND isset( $_POST['q2'] ) AND isset( $_POST['q1'] ) ) {
    $_SESSION["checkboxes_selected"] = 1;
    echo '<input type="submit" name="submit" value="Continue" />';
} else
    echo "Please Check All Boxes";

?> 

And on the next page you can check:

<?php
if ( isset( $_SESSION["checkboxes_selected"] ) ) {
    // do things
} else
    die( "You have to check the 3 checkboxes!" );

?>