mas Herman, sorry belum bisa nyoba2 ,
lagi sibuk ngetik artikel nih .. mau bantuin ?? :)
kalo teorinya sih begini

1. karena setau saya document.write cuman dipanggil sekali
   jalan satu2nya harus pake tag HTML meta refresh , coba
   liat di posting sebelumnya di atas, ...
2. pake document.write(ideas[rand(ideas.length)]);
3. jangan pake image map .. :) sorry nggak bisa yang ini ...
    mungkin yang lain bisa bantu ???

btw,  ini ada script yang lebih bagus .. dari www.webtechniques.com


------------------------------------------------------------
Script 9: Ad Rotation
It's very simple to rotate ads (or other images) so that
visitors see a variety of advertisements when they visit your
site (see bellow). Of course, using JavaScript for ads
means that only users with JavaScript browsers (and with
scripting turned on) will see your ads.

One way to solve this problem is to use the NOSCRIPT tag.
You can place a static ad between NOSCRIPT and
/NOSCRIPT tags. Browsers that execute JavaScript will
ignore the static ad, while other browsers will show it.

------------------------------------------------------------
//Rotating Ads
<script>
<!-- The following is the ad rotation code
function rotatead() {
rnd.today=new Date();
rnd.seed=rnd.today.getTime();

function rnd() {
         rnd.seed = (rnd.seed*9301+49297) % 233280;
         return rnd.seed/(233280.0);
         };

function rand(number) {
         return Math.ceil(rnd()*number);
         };

adnum=rand(3);  // number of ads: 3
document.write("<CENTER>");
if (adnum==1) {
   document.write(
  "<A HREF=\"http://www.indoglobal.com\">
   <IMG SRC=images\indoglb.gif ALT=\"Visit our sponsor, Who has Dual T3
Connections with Dual PIII 450 Mhz :)\" ></A>");
   }
if (adnum==2) {
   document.write(
  "<A target=_top HREF=\"http://www.alistapart.com\">
   <IMG SRC=ad2.gif ALT=\"Visit our suporter and inspiration\" ></A>");
   }
if (adnum==3) {
   document.write(
  "<A target=_top HREF=\"mailto:[EMAIL PROTECTED]\">
   <IMG SRC=ad3.gif ALT=\"Send Us Feedback!\" ></A>");
   }
document.write("</CENTER>");

}


(C) www.webtechniques.com , sory diubah2 dikit :P

Semoga bermanfaat dan dapat digunakan ( HOPELY USEFULL and USABLE)
Kenapa yah bahasa Indonesia ... kedengarannya selalu lebih panjang ? :)

Doni Yudono,
Editor
http://www.toekangweb.or.id
Let's Make Indonesian Web Better






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