function showHide(show, hide) {

   var objectShow = document.getElementById(show).style;
   var objectHide = document.getElementById(hide).style;

   if(objectShow.display == 'block') {
      objectShow.display = 'none';
   }
   else {
      objectShow.display = 'block';
   }
   objectHide.display = 'none';
}