How to use timthumb in WP MU

I think to show the first image as thumb in wp front page or blog layout is very common for any theme. But to use it in wordpress mu version is not direct or need to do some hack or modify the normall process of adding timthub. Normally we upload images from wp media manager and use those in posts. In normal wordpress the upload dir is wp-content/uploads and files and images are uploaded to that directory. In wordpress mu version files are uploaded by user basis folder and for this wp-content/blogs.dir/userid is the uploaded dir for any image. here user id is named as folder name for each user. then wp-content/blogs.dir/userid/files. But when u browse the site the image link format is like http://yoursitename/files/year/month/image name but format is reshaped by the wp mu htacces which real physical path is like wp-content/blogs.dir/userid/files/year/month/image name.
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