Untitled

<html>
<head>
<script language="JavaScript" type="text/javascript">

function validate(frm)
{
  var SomeChecked = false;
  for(var i = 0; i < tracks.length; i++)
  {
      if(tracks[i].checked)
      {
          SomeChecked = true;
          var url= tracks[i].value;
          window.open(url,'Download');
      }
  }
  if(!SomeChecked)
  {
      alert("Please select atleast one track");
  }
  return false;
}

</script>
</head>

<body>

<form method="post" onSubmit="validate(this);">

<input type="checkbox" value="http://abc.mp3" id="track_1" name="tracks"><a href ="01 - Sun Beliya - Lata, SP Balasubramaniam @ Fmw11.com.mp3">01 - Sun Beliya - Lata, SP Balasubramaniam @ Fmw11.com.mp3  </a> <br>
<input type="checkbox" value="http://xyz.mp3" id="track_2" name="tracks"><a href ="02 - Gabbar Singh Yeh Kah - Alka Yagnik, Amit Kumar @ Fmw11.com.mp3">02 - Gabbar Singh Yeh Kah - Alka Yagnik, Amit Kumar @ Fmw11.com.mp3  </a><br>
<input type="submit" value="Download" >
</form>

</body>
</html>