Pixelated jpegs with swf resizing

I have a swf embedded in a HTML page at 100% - so it resizes with the page. In this I am dynamically loading jpegs… however, if the swf is displaying at anything other than its original size the jpegs look clumsily pixelated… which would be understandable if they were bigger than their native size, but it also happens when theyre smaller… is there any way of fixing this?