Simple way to get motherboard page control values

<script type="text/javascript" language="javascript">
       function Check() {
var text = ('<%= %>');  //If there is a motherboard page + parent., the normal value does not need to be added.
if (confirm("You have shipped" + + "*")) {
               return true;
           }
           else {
               return false;
           }
       } 
   </script>