[рони]

chelkaz,

$(function(){
       var s = $(".bx_filter_container");
       s.each(function(indx, el){
        $(":checkbox", el).click(function(event) {
        $(el)[($(el).has(":checked").length ? "add" : "remove")+"Class"]("orange");
      });
         $(el)[($(el).has(":checked").length ? "add" : "remove")+"Class"]("orange");
      });


});