//画像を変更する
function chgImg(target, img){
  //document.getElementById(target).setAttribute("src",img);
  target.setAttribute("src",img);
}



//リンクを表示する
function viewLinks(target, left){
  document.getElementById(target).style.top = "105px";
  document.getElementById(target).style.left = left + "px";
  document.getElementById(target).style.display = "block";
}
//リンクを隠す
function hideLinks(target, par){
  document.getElementById(target).style.display = "none";
}

/*トップページの概要を表示する*/
function viewTopExp(target){
  if(document.getElementById(target).style.display == "block"){
    target = "topExp0";
  }

  document.getElementById("topExp0").style.display = "none";
  document.getElementById("topExp1").style.display = "none";
  document.getElementById("topExp2").style.display = "none";
  document.getElementById("topExp3").style.display = "none";

  document.getElementById(target).style.display = "block";

}