I am having the same problem except I get "swfobect" is undefind error
All I have done is to follow the below url
http://www.xcartmods.co.uk/adding-flash-x-cart-mods-pg-8.html
I downloaded the file
placed the "flash" folder in skin1
copied the texted given in that file in my txt_welcome
and then I get that "swfobect" is undefind
Its so simple to install, what have I done wrong