<a href="#!" style="margin-right: 150px; margin-top: 10px;" class="button_style1" id="buyTrigger">Заказать</a>

$("#buyTrigger").click(function(){
                       
               //Отправить запрос и показать уведомление.
               /*
               array(7) { 
               ["addUserMessage"]=> string(3) "add" 
               ["good"]=> string(23) "Товар локомотив №2(137)" 
               ["user_name"]=> string(4) "Вася" 
               ["user_email"]=> string(15) "velonew@mail.ru" 
               ["user_theme"]=> string(6) "454545" 
               ["user_message"]=> string(5) "6hjgh" 
               ["oldURL"]=> string(66) "http://pageone.bmcms.ru/index.php?com=order&elemId=137&tmpl=simple" }
                */
               var mid = $("#buyUserPhone").val();
               if(mid.length<4)
               {
                    $("#buyUserPhone").css("borderColor","red");
                    $("#buyUserPhone").css("borderWidth","2px");
                    $("#buyUserPhone").focus();
                     //$("#phone_error").show("slow");articleNumberbuyUserMail articleNumber
                     
                }
              else {                            
               $("#buyTrigger").css("display","none");
               $.post("components/order/update.php", { addUserMessage: "add",good:""+$("#articleNumber").val()+"", user_name: ""+$("#buyUserName").val()+"",user_email: ""+$("#buyUserMail").val()+"",user_theme: ""+$("#buyUserPhone").val()+"",user_message: ""+$("#buyUserComm").val()+"",oldURL: "index.php?com=order&elemId=0&tmpl=simple" },
               function(data){ 
                     $("#goBuyout").css("display","none"); 
                     $("#otvet").css("display","block");                                
                  //$("#goBuyout").html(data);                                                   
                });
               }
               return false;    
        });