slide mini cart vm2 not working correctly, any ideas?

[kobiashi]

hi
  i have started using the slide mini cart vm2 plugin, but it doesnt seem to be working correctly, i have noticed on the demo site when you click add to c art there is an additional window that opens to say item added to cart, i dont get this, also i am using firebug on firefox browser and everytime i click add to cart their is a scripting error, but im not sure what i`m looking at, any ideas would be very helpful at this point.