Unable to cache dynamic advertisements coming from a live url.

Hi there, I am fetching external header (any content) from a live site. And I am cacheing it for 2 minutes using the method ob_start().The code s given below:
check2.php
<?php
$cacheFile = 'cache.html';
$t2=(filemtime($cacheFile));
$t=time();
$d=$t-$t2;
if ($d<120)
{
$content = file_get_contents($cacheFile);
echo "in cache";
echo $content;
}
else
{
echo "not in cache";
ob_start();
$blog_baseurl="http://internetworld.idg.se/";
$url = "http://internetworld.idg.se/?exportHeader=true&standAlone=true&disableLogin=true";
$sideTopPage =file_get_contents($url);
$replaceArray = array('src="/');
$sideTopPage = str_replace($replaceArray, 'src="'.$blog_baseurl, $sideTopPage);
$replaceArray = array('href="/');
$sideTopPage = str_replace($replaceArray, 'href="' . $blog_baseurl, $sideTopPage);
echo $sideTopPage;
$content = ob_get_contents();
ob_end_clean();
file_put_contents($cacheFile,$content);
echo $content;
ob_end_clean();
}
?>

the above code is generating a cahe file named cache.html. But this cached file(cache.html) is also not loading very fast. The only reason is that cached file (cache.html) contains the following code due to which some adds are coming.

<div class="adContainer">
<script type="text/javascript" src="http://adserver.adtech.de/addyn|3.0|506|1040245|18003|16|ADTECH;loc=100;key=;grp=18003;asfunc=1;misc=1237453012837"></script>
<script type="text/javascript">showHeliosAd(1040245, 18003, false)</script>
</div>
So due to the above code cached content is not loading fast. If I remove the above code from cached file (cache.html) then cached content is loading extremely fast
So in the end I can say that the major problem is regarding the cacheing of dynamic advertisement that are fetched using a JavaScript.
any suggestions are most welcome

 

it's simple,
you can't "cache" the page which gets the content from javascript
If you want to display it faster, or as it should be done, first display the page, then in parell display the ads, you should place the javascript code in different file, and then get that file using ajax in parell