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Thanks,  Wissam!

So, for example, it would look like this?:

Disallow:?condition=

Disallow: ?cat=

Thanks. I didn't want to use rel="canonical" because there are thousands of variations of these parameters, and it would be time consuming, to say the least.

Hi guys:

What is the best way to keep Google from crawling certain urls with parameters? I used the setting in Webmaster Tools, but that doesn't seem to be helping at all. Can I use robots.txt or some other method? Thanks!

Some examples are:

<colgroup><col width="797"></colgroup>

www.mayer-johnson.com/category/assistive-technology?manufacturer=227

<colgroup><col width="797"></colgroup>

www.mayer-johnson.com/category/english-language-learners?condition=214

<colgroup><col width="797"></colgroup>
| www.mayer-johnson.com/category/english-language-learners?roles=164 |
| www.mayer-johnson.com/category/english-language-learners?roles=165 |
| www.mayer-johnson.com/category/english-language-learners?roles=197 |

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