var rollCountBanner;
var rollPeriodBanner = 2000;
var isStartBanner = true;
var nnBanner = 1;
var ttBanner = false;
function change() {
  if (isStartBanner) {
    if (nnBanner > rollCountBanner) {
	  nnBanner = 1;
	}
    setFocusBanner(nnBanner);
  }else{
    ttBanner = setTimeout('change()', 1000);
  } 
}
function setFocusBanner(i){
  if (ttBanner) {
	clearTimeout(ttBanner);
  }
  selectLayerBanner1(i);
  nnBanner=parseInt(i)+1;
  ttBanner=setTimeout('change()', rollPeriodBanner);
}
function selectLayerBanner1(i){
  for (var j = 1; j <= rollCountBanner; j++) {
	if (j == i)	{
	  document.getElementById("focusBanner" + j).style.display = "block";
	  document.getElementById("changeBanner" + j).className="current";
	} else {
	  document.getElementById("focusBanner" + j).style.display = "none";
	  document.getElementById("changeBanner" + j).className="";
	}
  }
}
// JavaScript Document