hey thanks for your reply!

but...

I think you missunderstood my question or i was not able to explain my question properly. please find the question details below.

i want to create the effect in which the user can scratch any areas of the movie at his own discreation just like we have scratch phone card to relieve pin numbers in real world. ie when he scratch's off the particular area of the movie with the help of mouse action the hiddenimage is visible only specific to that area. The user will have to scratch off the whole card with mouse action to see whole of the hidden image below.

let me put it this way
...to scratch the top layer by mouse action ie moving the mouse over the picture while keeping the left button pressed, to show the hidden layer below.

any input on this topic will be highly appreciated!

Thanks