Problems with images in the db

Hi, I have inserted small images into the db and I am trying to echo them back and when I do it, I keep getting the Header warnings. How do I overcome that ? When I try to just echo the image it works fine, but when I try to add a few more lines like echoing other rows which have firstname and lastname of the people nothing comes out besides the picture. If I change the positions then I immediately get that Header was not the first line. Any help is appreciated. Thank You Sunil