I've got this :
<form action="index.php" method="get">
<input type="checkbox" name="Convs_revenue"
<? echo (isset($_GET['extra_Data'])?"value='yes'":"value='no'");?>
<? if (isset($_POST['extra_Data']) ) echo 'checked="checked"'; ?> >extra_Data </input>
<input type="submit" value="send">
</form>
Now I need to keep the value of tp keep the value of the checkbox, and to unset it when its unchecked. I MUST use the GET method for this form, and this need to be at the same page as well.
What happen is that its always seem to be checked no matter what I do, and the get array always keep this at on...