function changeClassById(id,newClass) 
{ 
  document.getElementById(id).className = newClass;

}
function resetClass(id,newClass)
{
  var newClass = "services"
  document.getElementById('one').className = newClass;
  document.getElementById('two').className = newClass;
  document.getElementById('three').className = newClass;
  document.getElementById('four').className = newClass;
  document.getElementById('five').className = newClass;
  document.getElementById('six').className = newClass;
}