$.extend($.fn.validatebox.defaults.rules,{
                remote2:{
                    validator:function(value,param){
                        var postdata={};
                        postdata[param[1]]=value;
                        var result=$.ajax({
                            url:param[0],
                            dataType:"json",
                            data:postdata,
                            async:false,
                            cache:false,
                            type:"post"
                        }).responseText;
                        return result=="true";
                    },
                    message:"Please fix this field."
                }