i have certain validation check via a jquery/javascript in asp.net 3.5 vb.net

Code:
<script type="text/javascript">

         $(function() {
             $('#<%= btn_submitt.ClientID %>').click(function() {

                 valid = true;
                 var checkedControls = $('#<%= CheckBoxList1.ClientID %>').find('input:checkbox:checked');
                 var selected = jQuery('#<%= Rdbtn_hotelbook.ClientID %> input:checked').val();

                 if (checkedControls.length == 0) {

                     alert('Please select atleast one checkbox from Company Type');

                 }
                 else if (selected == 0) {
                     var checkedControls1 = $('#<%= hotel_requirement_Types.ClientID %>').find('input:checkbox:checked');

                     if (checkedControls1.length == 0) {

                         alert('Please select atleast one from hotel requirement');

                     }

                   
                     //             alert('u need to explore placeholder');

                 }

             });


             return false;


         });    
       
       </script>
and on submitt button i have following code (see my next post in same thread)

it is validation through jquery/javascript but when it comes to code behind it insert when else conditon is true . now the problem is that i want to pass certain variable from jquery/javascript to code behind to validate that u can isnert to tables(mind that i am inserting stuff to multiple table) the main table is users .and it returns userid and i insert into another tables by using same userid.

i hope i m quite clear about my problem if it is still not please post me back
any urgent reply would be really helpful