Why does the picture go blurry when I play old Xbox games on Xbox 360?



I have a 32" flat screen LCD HDTV. When I play Xbox 360 games it works just fine, but when I put in a old regular Xbox game and play it, the picture gets blurry. I mean I have picture and sound and stuff but it’s like its blurry, like if you hit your head and sees double. This happens with all games that are for the old Xbox. What should I do, have anybody had this problem?