function expand(s)
{
  var td = s;
  var d = td.getElementsByTagName("div").item(0); 
  td.className = "menuHover";
  //取得子菜单下的那个块
  d.className = "menuHover";
 
}
function collapse(s)
{
  var td = s;
  var d = td.getElementsByTagName("div").item(0);
  td.className = "menuNormal";
  d.className = "menuNormal";
}
function expandTd(s)
{
  var td = s;
  td.className = "menuHover";
  //取得子菜单下的那个块
 
 
}