function showLAYER(idName){

   hideLAYER('mumbai');
   hideLAYER('bangkok');
   hideLAYER('kualalumpur');
   hideLAYER('singaporeair');
   hideLAYER('jakarta');
   hideLAYER('hochiminh');
   hideLAYER('manila');
   hideLAYER('osaka');
   hideLAYER('melbourne');
   hideLAYER('tenshin');
   hideLAYER('hongkong');
   hideLAYER('shanghai');
   hideLAYER('seoul');
   hideLAYER('auckland');

  if(document.getElementById) //NN6,Mozilla,IE5用
    document.getElementById(idName).style.visibility
                                           = 'visible'

  else if(document.all)       //IE4用
    document.all(idName).style.visibility   = 'visible'

  else if(document.layers)    //NN4用
    document.layers[idName].visibility     = 'show'


}
function hideLAYER(idName){

  if(document.getElementById) //NN6,Mozilla,IE5用
    document.getElementById(idName).style.visibility
                                           = 'hidden'

  else if(document.all)       //IE4用
    document.all(idName).style.visibility  = 'hidden'

  else if(document.layers)    //NN4用
    document.layers[idName].visibility     = 'hide'

}