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Thank you very much for your help!
I have checked that all URLs of the banner are correct.
They work well in the testing environment, when I click the banner, a new windows opened and a link like thsi appeared,
"http://www.hkstla.org/en/banners.php?op=click&bid=70", and then the original URL will be converted such as "http://www.seabridgehk.com/".
However, this does not work in my production environment.