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Overcome values in url parms throwing an error

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Last Modified: 2013-12-25
Some of my dynamic Cold fusion pages with url parms have been indexed in search engines.

However the search engines have added some hex values into the query string and it
throws an error when people link back to my page as my cold fusion code is expecting url parms that cant now be found due to the extra hex characters in cgi.string
 Here is the error:

HTTP Referrer     http://us.m2.yahoo.com/w/onesearch?.lang=en&p=housesitting+in+Tampa&.tsrc=apple&submit=oneSearch&tsrc=apple&first=1
         Template          /city_house_sitter_profile.cfm
     Query String      MEM=2145548445&%253Bci=Tampa&%253Bst=Florida
     User name        
     HTML Code Format  <PRE>Element CI is undefined in URL.  &lt;br&gt;The error occurred on line 3.</PRE>

So  the search engine has added %253B - and cold fusion now cant find url.ci

How do I get around this so I can get the value of url.ci  or remove %253B
I understand cgi-query-sting is read only so cant change it?

Thanks
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