Cannot delete background?

I need help!!!

I have an image of a car and i want to import it into flash.

I want to import only the car and not the white background around it.

I have used photoshop background eraser feature which deletes
the white background and displays the transparent background but when i import it into flash, the image has still got the white background.

What am i doing wrong???

I am going crazy…aahhhhhhhhhhh