How to make cd arguments case INsensitive?

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http://unix.stackexchange.com – Sometimes while accessing the various directories it happens most of the times that i remember the names or at least part of the names of a directory under our Linux system. But some of the directories are named starting with first character caps or one of the characters in the middle of the name Upper case. Can anyone suggest how can i make the arguments following cd command case INSENSITIVE, such that if i perform cd BackupDirectory or cd backupdirectory it could enter the directory name BackupDirectory. Ofcourse i don't want to screw the things for other users so if the above is possible, (HowTos)