//--表示属性set(表示)
  function showLAYER(layName){                                    
    if(document.getElementById)         //e5,e6,n6,n7,m1,o6,o7,s1用
      document.getElementById(layName).style.visibility='visible'
    else if(document.all)               //e4用
      document.all(layName).style.visibility='visible'
    else if(document.layers)            //n4用
      document.layers[layName].visibility='show'
  }

  //--表示属性set(非表示) 
  function hideLAYER(layName){
    if(document.getElementById)         //e5,e6,n6,n7,m1,o6,o7,s1用
      document.getElementById(layName).style.visibility='hidden'
    else if(document.all)               //e4用
      document.all(layName).style.visibility='hidden'
    else if(document.layers)            //n4用
      document.layers[layName].visibility='hide'
  }

  //--すべてを隠す
  function hideALL(){
    hideLAYER('img0')
    hideLAYER('img1')
    hideLAYER('img2')
  }