The IE cache folder is specified in the registry. Have a look at the following key: HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\Explorer\Shell Folders
There is a String value here called Cache, with a default of "\Windows\Profiles\Guest\Temporary Internet Files".
Create a folder on the storage card, e.g. "iecache", and change the value of Cache to "\Storage Card\iecache". This folder will the be used for the IE cache.