Jquery checkbox operation

$("input[name='cb_email_maybe_nt']").attr("checked",[var.emailMaybeNt;noerr;]);

$('input.auto_send').click(function(){
       var param_id=$(this).attr('param_id');
       var param_value_int=0;
       if ($(this).attr('checked')=='checked'){
          param_value_int=1;
       }            
       $.ajax({
                type:'GET',
                url:'ajax_process.php',
                data:{'param_id':param_id,'param_value_int':param_value_int},
                success:function(data){}
       });    
});