Newbie (Easy Question) Centering div style position? Options

[Isathara]

I'm making a simple website for a friend, and all I'm doing is centering text on a backround image so it looks like it's actually coded properly. My image is centered, but the problem is that I need a fixed hight, width, and length for my div text box, but I don't know how to keep those three fixed while centering it in relation to 'left'.
Here's my coding, and I need the top, width, and height to stay as they are while centering 'left'.

<div style="position : absolute; top : 460px; left : 500px; width : 550px; height: 430px ;COLOR:white;FONT-FAMILY:arial; FONT-SIZE:8pt; background : transparent; overflow :auto;">

This is probably a very obvious question, but I need help nonetheless. How should I do it?

[pandy]

http://css-discuss.incutio.com/?page=CenteringBlockElement

Your absolute positioning will override most things you try to do though. Why position it 500px from the left if you want it centered?

[Darin McGrew]

Also, don't use pt for font sizes. Use 100% for body text, use larger percentages for headings and the like, and use (slightly) smaller percentages for legalese and similar fine print.