var bannerAD=new Array();
	var bannerADlink=new Array();
	var bannerADtitle=new Array();
	var adNum=-1;
	var slidetime=5000; //毫秒

	//广告 图片 链接
	bannerAD[0]="/images/tuiguang/2010/ins20100301.png";
	bannerADlink[0]="http://www.i21st.cn/poll/1.html";
	bannerADtitle[0]="欢迎参加21世纪报有奖调查";

	bannerAD[1]="/images/tuiguang/2010/inside.ghgy2010.jpg";
	bannerADlink[1]="http://elt.i21st.cn/ghgy2010/";
	bannerADtitle[1]="关注《教育改革和发展规划纲要》";

	bannerAD[2]="/images/tuiguang/uhome.jpg";
	bannerADlink[2]="http://elt.i21st.cn/";
	bannerADtitle[2]="21英语教师网重磅推出";
	
	bannerAD[3]="/images/tuiguang/ins2.png";
	bannerADlink[3]="http://contest.i21st.cn/";
	bannerADtitle[3]="第15届21世纪杯全国英语演讲比赛";


	var AllAdNum=bannerAD.length;

	var preloadedimages=new Array();
	for (i=1;i<bannerAD.length;i++){
		preloadedimages[i]=new Image();
		preloadedimages[i].src=bannerAD[i];
	}

	function setTransition(){
		if (document.all){
			homeADrotator.filters.revealTrans.Transition=Math.floor(Math.random()*23);
			homeADrotator.filters.revealTrans.apply();
		}
	}

	function playTransition(){
		if (document.all){
			//homeADrotator.filters.revealTrans.play();
			$("#homeAdTitle").html(bannerADtitle[adNum]);
			for (ii=0; ii<AllAdNum; ii++){
				if (ii==adNum){
					$("#homeAdButton"+ii).removeClass("DisplayPage1");
					$("#homeAdButton"+ii).addClass("DisplayPage2");
				}else{
					$("#homeAdButton"+ii).removeClass("DisplayPage2");
					$("#homeAdButton"+ii).addClass("DisplayPage1");
				}
			}
		}
	}

	function nextAd(){
		if(adNum<bannerAD.length-1){
			adNum++ ;
			var timeOutStemp=slidetime;
		}else{
			adNum=0;
			var timeOutStemp=slidetime*2;
		}
		//setTransition();
		document.images.homeADrotator.src=bannerAD[adNum];
		playTransition();

		theTimer=setTimeout("nextAd()", timeOutStemp);
	}


	function displaythisAd(thisAdNum){
		adNum=thisAdNum;
		//setTransition();
		document.images.homeADrotator.src=bannerAD[adNum];
		if (document.all){
			//homeADrotator.filters.revealTrans.play();
			$("#homeAdTitle").html(bannerADtitle[adNum]);
			for (ii=0; ii<AllAdNum; ii++){
				if (ii==adNum){
					$("#homeAdButton"+ii).removeClass("DisplayPage1");
					$("#homeAdButton"+ii).addClass("DisplayPage2");
				}else{
					$("#homeAdButton"+ii).removeClass("DisplayPage2");
					$("#homeAdButton"+ii).addClass("DisplayPage1");
				}
			}
		}
	}

	function jump2url(){
		jumpUrl=bannerADlink[adNum];
		jumpTarget='_blank';
		if (jumpUrl != ''){
			if (jumpTarget != ''){
				window.open(jumpUrl,jumpTarget);
			}else{
				location.href=jumpUrl;
			}
		}
	}

	function displayStatusMsg() {
		status=bannerADlink[adNum];
		document.returnValue = true;
	}


	function displayhomeAdButton() {
		var homeAdButtons="";
		for (j=0;j<AllAdNum;j++){
			bnum=j+1;
			if (j==adNum){
				var thisAdbutton="<a class='DisplayPage2 DisplayPage' id='homeAdButton"+j+"' onclick='displaythisAd("+j+");'>"+bnum+"</a>";
			}else{
				var thisAdbutton="<a class='DisplayPage1 DisplayPage' id='homeAdButton"+j+"' onclick='displaythisAd("+j+");'>"+bnum+"</a>";
			}
			homeAdButtons=thisAdbutton+homeAdButtons;
		}
		$("#showAdButtons").html(homeAdButtons);
	}