function change_description(type) {
   if ( type == 'short' ) {
      document.getElementById("descr_full").style.display = "none";
	  document.getElementById("descr_short").style.display = "block";
   }
   
   else if ( type == 'full' ) {
      document.getElementById("descr_full").style.display = "block";
	  document.getElementById("descr_short").style.display = "none";
   }
}