Hola amigos, tengo este codigo que es una cuenta atras, pero me gustaria que se parase el solo cuando llegara al dia y hora establecidos. 
 
Me podeis ayuda por favor, ?
 
Codigo :
---------
 
 
<html>
<head>
<title>RELOJ</title>
<SCRIPT language="JavaScript">
<!-- hide script
//change your event date event here.
	var eventdate = new Date("February 15, 2007 19:00:00 GMT+1");
	function toSt(n)
	{
		s=""
		if(n<10) s+="0"
		return s+n.toString();
	}
	function countdown()
	{
		cl=document.clock;
		d=new Date();
		count=Math.floor((eventdate.getTime()-d.getTime())/1000);
 
		cl.secs.value=toSt(count%60);
		count=Math.floor(count/60);
		cl.mins.value=toSt(count%60);
		count=Math.floor(count/60);
		cl.hours.value=toSt(count%24);
		count=Math.floor(count/24);
		cl.days.value=count; 
 
		setTimeout("countdown()",1000);
	}
// end script -->
 
</SCRIPT>
</head>
<body onLoad="countdown()">
<FORM name="clock"><center>
	<TABLE BORDER=1 CELLSPACING=1 CELLPADDING=0 BGCOLOR="#000000" width=500>
     	<TR  BGCOLOR="#990000"> 
          	<TD bgcolor="#990000"><FONT face="Impact, Verdana, Arial, Helvetica, sans-serif" COLOR="#FFFFFF" size=1><b>Algo va a cambiar...</b></FONT></TD>
			<TD ALIGN=left><FONT face="Verdana, Arial, Helvetica, sans-serif" COLOR="#FFFFFF" size=1><B>Dias:</B></FONT></td>
               <td> <INPUT type="text" name="days" size=2 style="border-style: solid; border-color: #990000; background-color: #990000; font-family: Verdana; font-weight: bold; font-size: 8pt; color: #FFFFFF"></TD>
               <TD ALIGN=left><FONT face="Verdana, Arial, Helvetica, sans-serif" COLOR="#FFFFFF" size=1><B>Horas:</B></FONT></td>
               <td> <INPUT name="hours" size=2 style="border-style: solid; border-color: #990000; background-color: #990000; font-family: Verdana; font-weight: bold; font-size: 8pt; color: #FFFFFF"></TD>
               <TD ALIGN=left><FONT face="Verdana, Arial, Helvetica, sans-serif" COLOR="#FFFFFF" size=1><B>Minutos:</B></FONT></td>
               <td> <INPUT name="mins" size=2 style="border-style: solid; border-color: #990000; background-color: #990000; font-family: Verdana; font-weight: bold; font-size: 8pt; color: #FFFFFF"></TD>
               <TD ALIGN=left><FONT face="Verdana, Arial, Helvetica, sans-serif" COLOR="#FFFFFF" size=1><B>Segundos:</B></FONT></td>
               <td> <INPUT name="secs" size=2 style="border-style: solid; border-color: #990000; background-color: #990000; font-family: Verdana; font-weight: bold; font-size: 8pt; color: #FFFFFF"></TD>
		</tr>
	</table>
</form>                  
</body> 
   
 
