function openWindow(url)
{
window.open(url,'','directories=no,location=no,menubar=no,resizable=yes,scrollbars=yes,status=no,toolbar=no,top=10,left=10,height=500,width=600');
}

function openPhotoWindow(url)
{
window.open(url,'','directories=no,location=no,menubar=no,resizable=yes,scrollbars=yes,status=no,toolbar=no,top=10,left=10,height=680,width=850');
}


function checkSongs(f, mp3File, gpFile)
{
  if(mp3File=='')
    if(f.mp3.value!='') f.sendMp3File.value='true';

  if(gpFile=='')
    if(f.gp.value!='') f.sendGpFile.value='true';
}


function checkCovers(f, plFile, enFile)
{
 if(plFile=='')
    if(f.file_pl.value!='') f.sendPLCover.value='true';

  if(enFile=='')
    if(f.file_en.value!='') f.sendENCover.value='true';
}


function charsLeft(textarea, counter, maxchars)
{
  if(textarea.value.length>300)
  {
    textarea.value.substr(0, maxchars);
  }
  
  counter.value = maxchars-parseInt(textarea.value.length);
}