javascript - Display Google AdSense ads to search engine visitor only -

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i'm using below blogger/weebly code displaying adsense ads search engine visitor.
code not working...
ads not showing...
whats wrong code?

<script type="text/javascript"> if (document.referrer.match(/google|yahoo|bing|altavista|digg/)) {  google_ad_client = "xx-xx-xxxxxxxxxxxxxxxxxx"; /* xxxxxxxx xxxxxx xxx xxx xxx xx xxxxxx */ google_ad_slot = "xxxxxxxxxxxxxx"; google_ad_width = xxx; google_ad_height = xxx;  var script = document.createelement("script"); script.setattribute("src", src); document.getelementsbytagname("head")[0].appendchild(script); } else { // show visitors not referred search engine } </script>

please me, sir. thanks.

var script = document.createelement("script"); script.setattribute("src", src); // problem. src variable doesn't exist document.getelementsbytagname("head")[0].appendchild(script);

this code correct. adds script element head. problem src variable not defined anywhere.


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