AS2 loadmovie using var

Hi
I’m sure this has been asked and answered several times but I couldnt find an answer via the search, so my apologies for asking again.

I’m pulling data using an asp page and have managed to get the vars to fill as I want and they are being passed to the movie (Flash8) the text box and the button url are successfully using the vars being passed but I havent been able to get an image to load using it’s var. I’ve tested that the var is being passed in correctly as the data successfully fills a text field.
Can someone please tell me what I’ve done wrong.

This is what I have on an empty mc but it keeps returning as undefined

onClipEvent (load) {
    loadMovieNum(image_url,0);
}

I also tried this on a frame

loadMovieNum(image_url, image_loader);

Many Thanks in advance for any help
Sue