<form method="post" form name="dllink">
<input type="submit" name="dlbutton" value="Download" onClick="location.href="___DOWNLOADLINK___"">
</form>

<script type="text/javascript">
 <!--
  var secs = 3; // Wartezeit in Sekunden
  var wait = secs * 1000;
  document.dllink.dlbutton.disabled=true;
  for(i=1;i<=secs;i++)
  {
   window.setTimeout("update(" + i + ")", i * 1000);
  }
  window.setTimeout("timer()", wait);
  function update(num)
  {
   if(num == (wait/1000))
   {
    document.dllink.dlbutton.value = "Download";
   }
   else
   {
    printnr = (wait/1000)-num;
    document.dllink.dlbutton.value = "Download (" + printnr + ")";
   }
  }
  function timer()
  {
   document.dllink.dlbutton.disabled=false;
  }

 //-->
</script>

 onClick="function('document.dllink.dlbutton.disabled=true;');

  function onclick()
  {
   document.dllink.dlbutton.disabled=true;
  }