var arrayLength = 8;
var rid= "yuelu"
startAd(rid);

function startAd(thisrid)
{
	rid = thisrid;
	var where = TimezoneWhere();
	//document.write(where)

	if (where == -8 )
		displayChinaBanner()
	else if( where >=4 && where <=10)
		document.write('') //displayNorthAmericaBanner()
	else
		displayOtherBanner()
}

function displayChinaBanner()
{
	var i = 8;  //8 is the banner index for China
	displayBanners(i);
}

function displayOtherBanner()
{
	var i = 5;  //5 is the banner index for SMS, other areas
	displayBanners(i);
}

function displayNorthAmericaBanner()
{
	var currentdate = new Date();
	var i= currentdate.getSeconds() % arrayLength;	
	displayBanners(i);
}

function TimezoneWhere() {
	var today = new Date();
	return (today.getTimezoneOffset()/60);
}

function initArray() 
{
	this.length = initArray.arguments.length;
	for (var i = 0; i < this.length; i++)
	{
		this[i] = initArray.arguments[i];
	}
}

function displayBanners(iIndex)
{

	link = new initArray(
	"http://www.ecallchina.com/?r=" + rid,
	"http://www.ecallchina.com/?r=" + rid,
	"http://www.ecallchina.com/?r=" + rid,
	"http://www.ecallchina.com/?r=" + rid,
	"http://www.ecallchina.com/?r=" + rid,
	"http://www.ecallchina.com/sms/sms.aspx",
	"http://www.ecallchina.com/?r=" + rid,
	"http://www.ecallchina.com/?r=" + rid,
	"http://www.ecallchina.com/?index=6");

	image = new initArray(
	"http://www.ecallchina.com/banner/468x60banner.gif",
	"http://www.ecallchina.com/banner/ecallchina01.gif",
	"http://www.ecallchina.com/banner/ecallchina02.gif",
	"http://www.ecallchina.com/banner/ecallchina03.gif",
	"http://www.ecallchina.com/banner/ecallchina04.gif",
	"http://www.ecallchina.com/banner/ecallchina05.gif",
	"http://www.ecallchina.com/banner/ecallchina06.gif",
	"http://www.ecallchina.com/banner/ecallchina07.gif",
	"http://www.ecallchina.com/banner/ecallchina08.gif");

	text = new initArray(
	"Phone Card at eCallChina.com",
	"Special promotion Phone Card at eCallChina.com",
	"Phone Card at eCallChina.com",
	"Special promotion Phone Card at eCallChina.com",
	"Phone Card at eCallChina.com",
	"Free China Mobile Phone Short Message",
	"Free Phone Card at eCallChina.com",
	"Free Phone Card at eCallChina.com",
	"Call from China to USA, Canada and International Countries");

	var ranlink = link[iIndex];
	var ranimage = image[iIndex];
	var rantext = text[iIndex];
	document.write('<a href=\"' +ranlink+ '\" target=\"_blank\"><img src=\"'+ranimage+'\" border="0" alt=\"'+rantext+'\"></a>');
}