/*ページの先頭 */
function backToTop() {
  var x1 = x2 = x3 = 0;
  var y1 = y2 = y3 = 0;
  if (document.documentElement) {
      x1 = document.documentElement.scrollLeft || 0;
      y1 = document.documentElement.scrollTop || 0;
  }
  if (document.body) {
      x2 = document.body.scrollLeft || 0;
      y2 = document.body.scrollTop || 0;
  }
  x3 = window.scrollX || 0;
  y3 = window.scrollY || 0;
  var x = Math.max(x1, Math.max(x2, x3));
  var y = Math.max(y1, Math.max(y2, y3));
  window.scrollTo(Math.floor(x / 2), Math.floor(y / 2));
  if (x > 0 || y > 0) {
      window.setTimeout("backToTop()", 25);
  }
}

/* スタイルシート変更 */
function changestyle(cssfile) {
    document.getElementById('timetablecolor').href = cssfile;
}

/* 画像変換 */
function chnimg(imgname,chg){
	document.images[imgname].src = chg;
}
function blueon(){	document.images['imgwest'].src = "/images/img_blue_on.jpg";}
function blueoff(){	document.images['imgwest'].src = "/images/img_blue.jpg";}
function greenon(){	document.images['imgooyachi'].src = "/images/img_green_on.jpg";}
function greenoff(){	document.images['imgooyachi'].src = "/images/img_green.jpg";}
function orangeon(){	document.images['imgobihiro'].src = "/images/img_orange_on.jpg";}
function orangeoff(){	document.images['imgobihiro'].src = "/images/img_orange.jpg";}
function pinkon(){	document.images['imgokadama'].src = "/images/img_pink_on.jpg";}
function pinkoff(){	document.images['imgokadama'].src = "/images/img_pink.jpg";}
function purpleon(){	document.images['imgbankei'].src = "/images/img_purple_on.jpg";}
function purpleoff(){	document.images['imgbankei'].src = "/images/img_purple.jpg";}

data = new Array("/images/img_purple_on.jpg","/images/img_orange_on.jpg","/images/img_green_on.jpg","/images/img_blue_on.jpg");
preload= new Array();
for (i=0; i<data.length; i++)
{
	preload[i] = new Image();
	preload[i].src = data[i];
}