what is the value that will be stored if the checkbox is checked?
delete the text box from the page.
then add a checkbox and name it "Class"
Set the value to be what should be stored in the database when the checkbox is checked.
in the property inspector, click the dynamic button, and set the Check if option to:
php:
<?php echo((isset($_GET["invalid"])?ValidatedField("boatsresults","Class"):"".$row_W ADAboatsq["Class"]."")); ?>
for the Equal to option, enter the same thing you entered for the value.
