Set width and height of FLV using attachMovie

i exported a video at 324x240 as a FLV file and imported into flash. i’m using the code below to load it. it loads fine but it’s huge. it looks like its about 500x500 or something.

i would assume the flv would load using it’s exported dimensions but it loads with wacked out dimensions regardless of what i specificy or even if don’t specify any at all.

this.attachMovie("FLVPlayback", "my_FLVPlybk", 10, {_width:324, _height:240, _x:0.0, _y:0.0}); = ""
my_FLVPlybk.contentPath = "";

any ideas? thanks