$( document ).ready(function() {
  $("#id").click(function() {
и тут обрабатываете появление исчезновение
});
});

a {
text-decoration:none;
}

<div align="center" id="countdown"></div>
<div align="center" id="countdown2"></div>
<script>
var eventstr = "Распродажа закончилась!";
var countdownid = document.getElementById("countdown");
var countdownid2 = document.getElementById("countdown2");

var montharray=new Array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec");

function CountDowndmn(yr,m,d){
    cdyear=yr;
    cdmonth=m;
    cdday=d;
    var today=new Date();
    var todayy=today.getYear();
    if (todayy < 1000)
    todayy+=1900;
    var todaym=today.getMonth();
    var todayd=today.getDate();
    var todayh=today.getHours();
    var todaymin=today.getMinutes();
    var todaysec=today.getSeconds();
    var todaystring=montharray[todaym]+" "+todayd+", "+todayy+" "+todayh+":"+todaymin+":"+todaysec;
    futurestring=montharray[m-1]+" "+d+", "+yr
    dd=Date.parse(futurestring)-Date.parse(todaystring);
    dday=Math.floor(dd/(60*60*1000*24)*1);
    dhour=Math.floor((dd%(60*60*1000*24))/(60*60*1000)*1);
    dmin=Math.floor(((dd%(60*60*1000*24))%(60*60*1000))/(60*1000)*1);
    dsec=Math.floor((((dd%(60*60*1000*24))%(60*60*1000))%(60*1000))/1000*1);
    if (dday < 10) dday = "0" + dday;
    if (dhour < 10) dhour = "0" + dhour;
    if (dmin < 10) dmin = "0" + dmin;
    if (dsec < 10) dsec = "0" + dsec;
    if(dday<=0&&dhour<=0&&dmin<=0&&dsec<=1){
    countdownid.innerHTML=eventstr;
    countdownid2.innerHTML=eventstr;
return
}
else {
    var lastchar = ""+dsec;    lastchar = lastchar.substring(lastchar.length-1,lastchar.length);
    var dsecstr = "";
    if (lastchar=="1") { dsecstr = ""; }
    if ((lastchar=="2")||(lastchar=="3")||(lastchar=="4")) { dsecstr = ""; }
    
    lastchar = ""+dmin;    lastchar = lastchar.substring(lastchar.length-1,lastchar.length);
    var dminstr    = "";
    if (lastchar=="1") { dminstr = ""; }
    if ((lastchar=="2")||(lastchar=="3")||(lastchar=="4")) { dminstr = ""; }

    lastchar = ""+dhour;    lastchar = lastchar.substring(lastchar.length-1,lastchar.length);
    var dhourstr   = "";
    if (lastchar=="1") { dhourstr = ""; }
    if ((lastchar=="2")||(lastchar=="3")||(lastchar=="4")) { dhourstr = ""; }

    lastchar = ""+dday;    lastchar = lastchar.substring(lastchar.length-1,lastchar.length);
    var ddaystr = "";
    if (lastchar=="1") { ddaystr = ""; }
    if ((lastchar=="2")||(lastchar=="3")||(lastchar=="4")) { ddaystr = ""; }
    countdownid2.innerHTML="0000·"+dday+ "" +ddaystr+"·"+dhour+""+dhourstr+"·"+dmin+""+dminstr+"·"+dsec+" "+dsecstr;
    countdownid.innerHTML="0000·"+dday+ "" +ddaystr+"·"+dhour+""+dhourstr+"·"+dmin+""+dminstr+"·"+dsec+" "+dsecstr;
}
setTimeout("CountDowndmn(cdyear,cdmonth,cdday)",1000);
}

CountDowndmn(2013,7,23);
CountDowndmn(2013,7,25);
</script>