function leftTrim(s) {
   while (s.substring(0,1) == ' ')
   {
      s = s.substring(1, s.length);
   }
   return s;
}

function rightTrim(s) {
   while (s.substring(s.length-1, s.length) == ' ')
   {
      s = s.substring(0,s.length-1);
   }
   return s;
}

function trim(s) {
   s = leftTrim(s);
   s = rightTrim(s);
   
   return s;
}