function showBig(id) {
  document.getElementById("clts_a_bImg").style.display='block';
  document.getElementById("clts_bImg").src='/img/clients/'+id+'_b.jpg';
}

function closeBig() {
  document.getElementById("clts_a_bImg").style.display='none';
  document.getElementById("clts_bImg").src='';
}