Preloaders And External Images

guys, i am currently working on a flash file so that its re-useable.

Currently a string of images are passed in via flash vars

flashvars: image1=db.jpg, image2=db1.jpg

the movie currently loads these into blank movie clips on a timeline with


now are these going to load into as they have an animation (fade in and out first image, fade in and out second image and so on)

my theory is that these wont preload and will just appear halfway through the animation or such like due to the fact they are external files being loaded in and arent factored in to a preloaders calculations as such?.