Help Image mapping please

I wasn't sure whether to put this in here or in web design because I'm sure both would have people who know but here is my issue... How do I determine the coordinate location on a photo? In other words, I have a photo and I am trying to create a photo map. I need a way to know coordinates for different positions on a picture.

I would prefer to not need a download to do this, but I can not find a method on my mac using preview

(or even a plug-in for safari?)

Please advise...
-Jake

Is it really that difficult? alright well how does anyone get image coordinates in any program? I havn't re-installed photoshop yet, but it looks like I havn't a choice...

It probably would be easiest just to intstall Photoshop and do it that way. There is a plugin for Firefox but not Safari, as far as I'm aware...

alright =\ I appreciate someone's response even though its not the one I was looking for I hope they built this into Coda

i use this.
http://www.pangloss.com/seidel/ClrHlpr/imagemap.html