Adding narration to ppt 2003

[Tariffcom]

I am running ppt 2003 and have already set my timings on my presentation. I want to add a voice over to the presentation and run it as a video on my website. The narrations on ppt only seems to allow me to add per slide and I have to click to move the slide on while I am recording. This leaves dead air and as I have single sentences which run over several slides, my narration is cut off as I move the slides on. Is there a way to record my narration fully and simply insert it to run on the timings I have already preset?

Any help appreciated!
Thx