function expandDiv(tahw) {
  table_contract = new Image(1,1);
  table_contract.src = "";
  table_expand = new Image(1,1);
  table_expand.src = "";
  what  = tahw + "_menu"
  where = tahw + "_table"
  gotox  = tahw + "_link"
  if (document.getElementById(what).style.display == "none") {
    document.getElementById(what).style.display = "";
    where.src = table_expand.src;
    gotox.href = ""
  } else {
    document.getElementById(what).style.display = "none";
    where.src = table_contract.src;
    gotox.href = ""
  }
}