Ставим в любое место
Code
<center> <span id="uClock">17:36:00</span></b></div>
<script type="text/javascript">
function clock_from(hour,min,sec){
clock="";
if(sec>59){sec=0;min=min+1;}
if(min>59){min=0;hour=hour+1;}
if(hour>23){hour=0;}
if(hour<10){clock+="0"+hour;}else{clock+=""+hour;}
clock+=":";
if(min<10){clock+="0"+min;}else{clock+=""+min;}
clock+=":";
if(sec<10){clock+="0"+sec;}else{clock+=""+sec;}
elem=document.getElementById('uClock');
elem.innerHTML=clock;
setTimeout("clock_from("+hour+","+min+","+(sec+1)+")",1000);}
clock_from(parseInt(document.getElementById('uClock').innerHTML.split(':')[0]),parseInt(document.getElementById('uClock').innerHTML.split(':')[1]),parseInt(document.getElementById('uClock').innerHTML.split(':')[2]));
</script> </center>
Время нужно будет настроить самому 
