impresssion hit doesn't count

<img src="http://c2.xxxcounter.com/c10/id/7/51175/0/">
<img src="http://cgi.sexlist.com/counter.cgi?TSLID=80236=1100">
<img src="http://ads.kuikun.com/ads/banner.cgi?id=pim&type=image">


the 3rd is my code....why it doesn't reload ?
but the first 2 codes are always reload ...

that why my impression log doesn't same the above 2 services.
tong111797Asked:
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TYoungConnect With a Mentor Commented:
When you print out the banner's header, place a Expires: header with it... such as:

print "Content-type: image/gif\n";
print "Expires: now\n\n";


Hope that helps.
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tong111797Author Commented:
thank you very much...
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