<!--
function showLAYER(layName){
  if(document.layers)document.layers[layName].visibility='show' 
  else if(document.all)document.all(layName).style.visibility='visible'
  else if ( document.getElementById )
               document.getElementById( layName ).style.visibility ='visible' 
}

function hideLAYER(layName){
  if(document.layers)document.layers[layName].visibility='hide' 
  else if(document.all)document.all(layName).style.visibility='hidden'
  else if ( document.getElementById )
               document.getElementById( layName ).style.visibility ='hidden' 
}

/*
function hideALL(){
  hideLAYER('gmenu');
  hideLAYER('miraimenu');
  hideLAYER('chikyum');
 
}

function hideALL2(){
	hideLAYER('disp');
}

function miraiLAYER(e1,e2){
hideLAYER('gmenu');
showLAYER('miraimenu');
}

function mirai2LAYER(e1,e2){
hideLAYER('gmenu');
hideLAYER('miraimenu');
}

function mirai3LAYER(e1,e2,e3){
hideLAYER('gmenu');
hideLAYER('chikyum');
showLAYER('miraimenu');
}

function godiLAYER(e1,e2){
hideLAYER('miraimenu');
showLAYER('gmenu');
}

function eventLAYER(e1,e2){
hideLAYER('chikyu');
showLAYER('gmenu');
}

function chikyuLAYER(e1,e2,e3){
hideLAYER('miraimenu');
hideLAYER('gmenu');
showLAYER('chikyum');
}

function chikyuLAYER(e1,e2,e3){
hideLAYER('miraimenu');
hideLAYER('gmenu');
showLAYER('chikyum');
}
*/
<!-------------->