function divShow(elem,div_count,visible_item)
{
   var i;
   
   for( i = 0; i < div_count; i++)
   {
      var div_obj = document.getElementById(elem + i);
      if( i != visible_item )
      {
         div_obj.style.display="none";
      }
      else
      {
         div_obj.style.display="";
      }
   }
}