Chaning the author in Word 2003 docs

I would like to change the original author's name in Properties/Summary in Word documents after I open the document. I know how to do this manually but would like to know if there is a macro that could do this. I tried doing a macro, but it doesn't seem to be working. I don't care if my initials replace the original initials or if the lines are blank. Is this possible? Thanks!