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Hmm... you have to find out how these parameters in the URLs are.<br />
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Check your visit counter / statistics / analytics and see from where visitors going to these links come from. It could be an external website linking to you in a strange way, a script on your site that is generating these parameters, or a number of other possible reasons. Once you find the source you can stop it or use the robots.txt to make the search engines ignore these urls, or even use htaccess 301 to redirect traffic from them.
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Hmm... you have to find out how these parameters in the URLs are.

Check your visit counter / statistics / analytics and see from where visitors going to these links come from. It could be an external website linking to you in a strange way, a script on your site that is generating these parameters, or a number of other possible reasons. Once you find the source you can stop it or use the robots.txt to make the search engines ignore these urls, or even use htaccess 301 to redirect traffic from them.

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In running some checks against my site I got an error alter like this:<br />
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The page with URL &quot;http://www.domain.com/images/main/276/?C=D;O=D&quot;&nbsp;can also be accessed by using URL &quot;http://www.domain.com/images/main/276/?C=N;O=D&quot;.<br />
Search engines identify unique pages by using URLs. &nbsp;When a single page can be accessed by using any one of multiple URLs, a search engine assumes that there are multiple unique pages. Use a single URL to reference a page to prevent dilution of page relevance. You can prevent dilution by following a standard URL format.<br />
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What is this ?C=D;O=D stuff?<br />
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These are directories that hold images.<br />
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In running some checks against my site I got an error alter like this:

The page with URL "http://www.domain.com/images/main/276/?C=D;O=D" can also be accessed by using URL "http://www.domain.com/images/main/276/?C=N;O=D".
Search engines identify unique pages by using URLs.  When a single page can be accessed by using any one of multiple URLs, a search engine assumes that there are multiple unique pages. Use a single URL to reference a page to prevent dilution of page relevance. You can prevent dilution by following a standard URL format.

What is this ?C=D;O=D stuff?

These are directories that hold images.



/main/276/?C=D;O=D - What is this?

Web development includes all aspects of presenting content on intranets and the Internet, including delivery development, protocols, languages and standards, server software, browser clients, databases and multimedia generation.

Web Development

Search Engine Optimization (SEO) is the process of improving the visibility of web content in search engines using an understanding of search engines' processes and algorithms. Also known as "natural" or "organic" search, it is distinct from paid web advertising. Performance is typically measured by testing the appearance of a website for targeted search terms, and more specifically, ranked positions in search for important keywords. Techniques focus on content optimization, technical optimization and link building.