// pop up window part
var popupwindow;
function popUp(name, filename){
	if ( (typeof popupwindow == "object") && (popupwindow.closed != true) )
	{
		popupwindow.location.href = filename;
		popupwindow.focus();
	}
	else
	{
		popupwindow = window.open(filename,name,'height=250,width=250,left=150,top=150,scrollbars=no,resizable=no');
		popupwindow.focus();
	}
}

// pop under window part
function popUnder(name, filename){
	popupwindow = window.open(filename,name,'height=300,width=720,left=150,top=150,scrollbars=no,resizable=no');
	popupwindow.blur();
	window.focus();
}

// coookie related stuff
function DeleteCookie(name){
	var exp = new Date();
	exp.setTime (exp.getTime() - 480);
	var cval = GetCookie (name);
	document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}

function getCookieVal(offset){
	var endstr = document.cookie.indexOf (";", offset);
	if (endstr == -1)
		endstr = document.cookie.length;
	return unescape(document.cookie.substring(offset, endstr));
}

function SetCookie(name, value){
	var argv = SetCookie.arguments;
	var argc = SetCookie.arguments.length;
	var expires = (argc > 2) ? argv[2] : null;
	var path = (argc > 3) ? argv[3] : null;
	var domain = (argc > 4) ? argv[4] : null;
	var secure = (argc > 5) ? argv[5] : false;
	document.cookie = name + "=" + escape (value) +
		((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
		((path == null) ? "" : ("; path=" + path)) +
		((domain == null) ? "" : ("; domain=" + domain)) +
		((secure == true) ? "; secure" : "");
	//alert ("cookie = " + document.cookie);
}

function GetCookie(name){
	var arg = name + "=";
	var alen = arg.length;
	var clen = document.cookie.length;
	var i = 0;
	while (i < clen)
	{
		var j = i + alen;
		if (document.cookie.substring(i, j) == arg)
			return getCookieVal(j);
		i = document.cookie.indexOf(" ", i) + 1;
		if (i == 0) break;
	}
	return null;
}

function CheckCookieSetting(){
	// check if cookie is there
	var the_cookie_info = GetCookie('IGMainCookie1');
	if (the_cookie_info == null) {
		// no cookie, then set one
		var expDate = new Date();
		expDate.setTime (expDate.getTime() + Adfreetime);
		SetCookie('IGMainCookie1',expDate,expDate);
		return false;
	}
	else {
		return the_cookie_info;
	}
}

function DoPopUp(){
	var expDate = CheckCookieSetting();
	if (expDate == false) {
		popUp('pop', AdURL);
	}
	else {
		// check the current time to see if we need to show ad
		var nowDate = new Date();
		var nowSeconds = Date.parse(nowDate);
		var expSeconds = Date.parse(expDate);
		if (nowSeconds < expSeconds) {
			// nothing to do within the ad-free time
		}
		else {
			// do the pop up again for over due time
			popUp('pop', AdURL);
			nowDate.setTime (nowDate.getTime() + Adfreetime);
			SetCookie('IGMainCookie1',nowDate,nowDate);
		}
	}
}

function DoPopUnder(){
	var expDate = CheckCookieSetting();
	if (expDate == false) {
		popUnder('pop', AdURL);
	}
	else {
		// check the current time to see if we need to show ad
		var nowDate = new Date();
		var nowSeconds = Date.parse(nowDate);
		var expSeconds = Date.parse(expDate);
		if (nowSeconds < expSeconds) {
			// nothing to do within the ad-free time
		}
		else {
			// do the pop up again for over due time
			popUnder('pop', AdURL);
			nowDate.setTime (nowDate.getTime() + Adfreetime);
			SetCookie('IGMainCookie1',nowDate,nowDate);
		}
	}
}