//alert('31');
var Pstart = 0;
var iImageNo = 4;
var iPosNo = 4;
var aADImage = new Array();
var aLINKTO = new Array();
aLINKTO[0] = "http://www.ipox.org.tw"
aADImage[0] = "./admin/bannerdoc/logo1.jpg"
aLINKTO[1] = "http://www.ipox.org.tw"
aADImage[1] = "./admin/bannerdoc/logo2.gif"
aLINKTO[2] = "http://fuli-garden.coa.gov.tw/"
aADImage[2] = "./admin/bannerdoc/120x60(1).jpg"
aLINKTO[3] = "http://ezcall.coa.gov.tw/event/"
aADImage[3] = "./admin/bannerdoc/120x60.gif"

function plusnum() {
	Pstart++;
	if (Pstart > 3) Pstart = 0;
}

function ad_goto(sImg) {
	var sURL;

//	根據圖片名稱取得超連結
	for (var i=0; i<iImageNo; i++) {
		if (document.images[sImg].src.search(aADImage[i])>0) {
			if (aLINKTO[i]=="") {
				return(false);
			}
			else {
				sURL = aLINKTO[i];
				window1 = window.open("");
				window1.opener = window;
				window1.location.href = sURL;
			}
		}
	}
}

function show_ad() {
	var imgaPoint = "";

	for (var i=0; i<iPosNo; i++) {
		imgaPoint = "ad_img" + i;
		linkPoint = "ad_link" + i;
		document.images[imgaPoint].src = aADImage[Pstart];
		plusnum();
	}

	if (iPosNo>iImageNo) {
//		解決當iImageNo=1時的問題
		plusnum();
		Pstart = Pstart - (iPosNo % iImageNo);
//		Pstart = Pstart + (1- (iPosNo % iImageNo));
	}
	else if (iPosNo==iImageNo) {
		plusnum();
	}
	else if (iPosNo<iImageNo) {
		Pstart = Pstart - (iPosNo-1);
		if (Pstart<0) {
			Pstart = Pstart + iImageNo;
		}
	}

	TimerID = setTimeout ("show_ad()",3000);
}