I desperately need it! Help!!!'
there's not (yet), but if you clear your cookies the desktop preference gets cleared (since it's stored in a cookie). :)
You wouldn't know how to clear cookies on an itouch do you?
settings > safari > clear cookies and data
that's assuming you're on ios5 (although it's probably the same prior but i don't remember :P) and that you're using safari, of course haha