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here is the wiki specifically devoted to your router.
http://dd-wrt.com/wiki/index.php/Linksys_WRT54G_v4.0
here is the link to the specific file you need. you would use your original firmware upgrade link....
http://www.dd-wrt.com/routerdb/de/download/Linksys/WRT54G/v4.0/dd-wrt.v24_mini_generic.bin/2123
this should be good enough for your purposes, however if you want more features, you can use this to add more AFTER the initial flash(the newer one is too fat to do an initial upgrade with)
http://www.dd-wrt.com/routerdb/de/download/Linksys/WRT54G/v4.0/dd-wrt.v24_std_generic.bin/1963
the generic install page(just to confuse you further) 
http://dd-wrt.com/wiki/index.php/Installation
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