function do_coolnew(Total,number,index){
 for (var i = 1; i <= number; i++) {
      document.getElementById('pth' +Total+ i).src = 'images/a'+i+'.jpg';
      document.getElementById('phtab' +Total+ i).style.display = 'none';
 }
  document.getElementById('pth' + Total+ index).src = 'images/b'+index+'.jpg';
  document.getElementById('phtab' + Total+ index).style.display = 'block';
}