Text validation to accept only alphabets

function onlyChar()
{
  if(((event.keyCode>=97)&&(event.keyCode<=122))
      || ((event.keyCode&>=65)&&(event.keyCode&<=90))
      || ((event.keyCode==46)||(event.keyCode==32)))
      {

         event.keyCode=event.keyCode;
       
      }
  else
         event.keyCode=0;
}