var setHs="<? echo date("Y/m/d h:i:s")?>"

                    function showBackTime(endTime){

                            var date=new Date();

                            var startTime=new Date(date.getFullYear()+"/"+(date.getMonth()+1)+"/"+date.getDate()+" "+date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());

                            var timer;

                            var addTime = startTime - new Date(setHs);

                            var t = (endTime-startTime+addTime)/1000 + 1;

                            if(t<1){return;}

                            (function (){

                                if (--t>0){

                                    for(var i=0;i<4;i++){

                                        $("#time"+i).html(minToBackTime(t)["t"+i]);

                                    }

                                }else{

                                    clearTimeout(timer);

                                    for(var i=0;i<4;i++){

                                        $("#time"+i).html("00");

                                    }

                                }

                                timer = window.setTimeout(arguments.callee,1000);

                            })();

                        }

                        function minToBackTime(min){

                            var t = Math.floor(min/86400);

                            min -= 86400*t;

                            var s = Math.floor(min/3600);

                            min -= 3600*s;

                            var f = Math.floor(min/60);

                            min -= 60*f;

                            return {t0:padLeft(t,10),t1:padLeft(s,10),t2:padLeft(f,10),t3:padLeft(min,10)};

                        }

                        function padLeft(t,l){   

                            t=(t<l)?("0"+t):t;

                            return t;

                        } 

                    showBackTime(new Date("2009/08/13 00:00:00"));

// JavaScript Document