Images all over the place

[bargains]

I have noticed that the product images have gone from being a fixed 200 by 200 pixels on my site to a whole range of random sizes, some as large as 500 pixels! This does not look nice or professional and i wonder what as happened? perhaps the code to fix size has been removed accidently http://www.wildactivityholidays.com
I notice that this is not the same for all stores.