Yet another question on mod_rewrite

yet without solution

[expert_21]

Ok, i know this has been asked a lot of times b4, and I have read [webmasterworld.com...]

However, i still am unsure how it applies to my situation.

I am running 4images php script, so there are like [url.com...]
[url.com...]
[url.com...]

where cat_id is category id and s is sessio.

as a result, google has been crawling all the same pages, treating them as different.

My question then, is how to stop google from doing that? I read it's by using mod_rewrite, but can it be applied in this situation? I only have access to .htaccess. Please help, as it is taking up a lot of my bandwidth. Any help is very much appreciated. Thank you in advance.

[DaveAtIFG]

These two links usually get people going in the right direction:

Search Engine-Friendly URLs [sitepoint.com]
Search Engine Friendly URLs with PHP and Apache [evolt.org]

[expert_21]

Hi, thanks for that links! However, what they did was to transform

[url.com...]

into [url.com...]

can I just transform them to [url.com...]

without session variables? thank you.