function changemenubgdef() {
  document.getElementById("TOP_headerimgin").style.background = "url(images/top_headerimg_main.jpg) no-repeat center top";
}

function changemenubg1() {
  document.getElementById("TOP_headerimgin").style.background = "url(images/top_headerimg_idea.jpg) no-repeat center top";
}

function changemenubg2() {
  document.getElementById("TOP_headerimgin").style.background = "url(images/top_headerimg_up.jpg) no-repeat center top";
}

function changemenubg3() {
  document.getElementById("TOP_headerimgin").style.background = "url(images/top_headerimg_challenge.jpg) no-repeat center top";
}

function changemenubg4() {
  document.getElementById("TOP_headerimgin").style.background = "url(images/top_headerimg_workplace.jpg) no-repeat center top";
}

function changemenubg5() {
  document.getElementById("TOP_headerimgin").style.background = "url(images/top_headerimg_commu.jpg) no-repeat center top";
}

function changemenubg6() {
  document.getElementById("TOP_headerimgin").style.background = "url(images/top_headerimg_health.jpg) no-repeat center top";
}

function changemenubg7() {
  document.getElementById("TOP_headerimgin").style.background = "url(images/top_headerimg_etc.jpg) no-repeat center top";
}

function changemenubg8() {
  document.getElementById("TOP_headerimgin").style.background = "url(images/top_headerimg_framework.jpg) no-repeat center top";
}