topical media & game development
basic-javascript-appendix-11-ch11-q2.htm / htm
<HTML>
<HEAD>
<SCRIPT LANGUAGE=JavaScript>
function getCookieValue(cookieName)
{
var cookieValue = document.cookie;
var cookieStartsAt = cookieValue.indexOf(" " + cookieName + "=");
if (cookieStartsAt == -1)
{
cookieStartsAt = cookieValue.indexOf(cookieName + "=");
}
if (cookieStartsAt == -1)
{
cookieValue = null;
}
else
{
cookieStartsAt = cookieValue.indexOf("=", cookieStartsAt) + 1;
var cookieEndsAt = cookieValue.indexOf(";", cookieStartsAt);
if (cookieEndsAt == -1)
cookieEndsAt = cookieValue.length;
cookieValue = unescape(cookieValue.substring(cookieStartsAt, cookieEndsAt));
}
return cookieValue;
}
function setCookie(cookieName,cookieValue, cookiePath, cookieExpires)
{
cookieValue = escape(cookieValue);
if (cookieExpires == "")
{
var nowDate = new Date();
nowDate.setMonth(nowDate.getMonth() + 6);
cookieExpires = nowDate.toGMTString();
}
if (cookiePath != "")
{
cookiePath = ";Path=" + cookiePath;
}
document.cookie = cookieName + "=" + cookieValue + ";Expires=" + cookieExpires + cookiePath;
}
</SCRIPT>
</HEAD>
<BODY>
<IMG SRC="AdvertImage1.jpg" NAME="imgAdvert">
<SCRIPT>
var imageNumber = getCookieValue("displayedImages");
var totalImages = 3;
if (imageNumber == null)
{
imageNumber = "1";
}
else
{
imageNumber = Math.floor(imageNumber) + 1;
}
if (totalImages == imageNumber)
{
setCookie("displayedImages","","","Mon, 1 Jan 1970 00:00:00")
}
else
{
setCookie("displayedImages",imageNumber,"","")
}
document.imgAdvert.src = "AdvertImage" + imageNumber + ".jpg";
</SCRIPT>
</BODY>
</HTML>
(C) Æliens
20/2/2008
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