I don't know which one you "perfectly copied" , but this one below works.
Checked two times, I could see your ads.

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<script type="text/javascript">
<!--
google_ad_client = "pub-5750360842820018";
google_ad_width = "728";
google_ad_height = "90";
google_ad_format = "728x90_as";
google_ad_type = "text";
google_ad_channel = "3910764164";
google_color_border = "FFFFFF";
google_color_bg = "FFFFFF";
google_color_link = "031545";
google_color_text = "2F63B3";
google_color_url = "008000";
//--></script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
---------------------------------------------------------------------------------------

P.S. You also had some //comments in the middle of the script, which I removed above.

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