function initImage(imageId) {
  image = document.getElementById(imageId);
  setOpacity(image, 0);
  image.style.visibility = 'visible';
  fadeIn(imageId,0);
}

function setOpacity(obj, opacity) {
  opacity = (opacity == 100)?99.999:opacity;

  // IE/Win
  obj.style.filter = "alpha(opacity:"+opacity+")";

  // Safari<1.2, Konqueror
  obj.style.KHTMLOpacity = opacity/100;

  // Older Mozilla and Firefox
  obj.style.MozOpacity = opacity/100;

  // Safari 1.2, newer Firefox and Mozilla, CSS3
  obj.style.opacity = opacity/100;
}

function fadeIn(objId,opacity) {
  if (document.getElementById) {
    obj = document.getElementById(objId);
    if (opacity <= 100) {
      setOpacity(obj, opacity);
      opacity += 10;
      window.setTimeout("fadeIn('"+objId+"',"+opacity+")", 50);
    }
  }
}

function rand(n) {
	seed=(0x015a4e35*seed)%0x7fffffff;
	return (seed >> 16)%n;
}

var now=new Date();
var seed=now.getTime()%0xffffffff;
var rot = 2;
var i=rand(2);
var ad_pic = new Array (2);
var linkto = new Array (2);
var description = new Array (2);


linkto[0]="";
ad_pic[0]="http://schnews.tn.edu.tw/uploads/schnews//2017-06/banner_sn_691_1.jpg";
description[0]="";
linkto[1]="";
ad_pic[1]="http://schnews.tn.edu.tw/uploads/schnews//2017-06/banner_sn_692_1.jpg";
description[1]="";

document.getElementById('tn_banners').innerHTML='<a id="banner_link" href='+linkto[i]+'>'+'<img id=\'tn_banner\' name="ad" src="'+ad_pic[i]+'" alt="'+description[i]+'"  title="'+description[i]+'" width=555 height=80 border=0></a>';
document.close();

//var linklength =  document.links.length-1;

function DynamicRoAD() {
	i++;
	i %= rot;
	document.ad.src = ad_pic[i];
	//document.links[linklength].href = linkto[i];
	document.getElementById('banner_link').href=linkto[i];
	document.ad.alt = description[i];
  initImage('tn_banner');
	setTimeout ('DynamicRoAD()',5000);
}

setTimeout ('DynamicRoAD()',5000);