Pictures stored in database and IE

Hi everyone, The pitfall I am trying to solve is confusing and to be honest I have not as much experience with http to solve it right now. My application is quite straightforward. Its purpouse is to load image off the MySQL and send it to client to render it. I have php script, which reads data together with file type off the table and sends it to client (of course after all necessary headers are sent). On the client then some five pictures are animated one after another (all beeing read from table as described above), so it looks like a simple animation. Under Mozilla this works fine, but under IE (6.0) the JavaScript OnLoad event on Body Tag just does not fire up. My suspicion is, that there is something in http protocol I missed/omitted/forgot to do, so IE still thinks that page is not finished loading and so the event handler does not gets executed. Is there something I have to send on the end after data are transmitted? Or, do I have to send just headers and data and nothing else. But anyway I think, problem is on PHP(?)/mine site, not on IEs side. Looking forward for your ideas, Ivo