JavaScript counter

[houssam_ballout]

hello all, as I am new to JavaScript, I'd some small pages to finish, I want some script that will display the number of seconds down till 0 according to the number of second that I can give it via text boxthanks

[aspnetguy]

HTML

<input type="text" id="secForCountDown"/> <input type="button" value="Start" onclick="start()"/><br/><br/><input type="text" id="countDown"/>

JS

var sec = null;function start(){  try  {	if(sec == null) sec = parseInt(document.getElementById('secForCountDown').value); 	sec--;	if(sec > 0) setTimeout(start, 1000);  }  catch(err){ alert(err.description + '\n\nCount down failed!'); }  }

Something like that. I didn't test it so it may have errors