anyone bought disney tickets online?

[triplets]

Hi,
I didn`t get any response to my last message re tickets so here I am again! I have been told to pre purchase for next year, looked online and am getting fed up of going through the booking process then finding out at the end that they stick pounds on when the ads say no credit card charges etc! Any recommendations? Also they say a park hopper never expires, so does that mean the left over days can be used in any Disney park, for example use 5 days in Florida then two in Paris?

[SoupDragon]

I'm fairly certainly Florida tickets are only valid for Florida.