var idPrev = "";
var elmPrev = null;

function fnOpen( id ){
  fnClose( idPrev );

  document.all.item(id).style.display = "block";
  window.event.srcElement.style.color = "white";
  window.event.srcElement.style.backgroundColor = "#336699";

  idPrev = id;
  elmPrev = window.event.srcElement;
}
function fnClose( id ){
  if( id.length != 0 ){
    document.all.item(id).style.display = "none";
  }

  if( elmPrev != null ){
    elmPrev.style.color = "#333333;";
    elmPrev.style.backgroundColor = "";
  }
}