Seth,
Which dividers specifically? And which "skin" are you using?

I am using minimal and the <hr>'s that I want to remove are primarily those that divide the navigation from the rest of the page and then the one before the header (http://theharperschool.org/concretedev/). However the designer I'm working with may want others removed so looking for a starting place to discover the rest. :-)

Thanks.

So - realized that I was not looking for <HR> tags but instead the border in CSS

I edited minimal CSS: For nav class commented out border entries. That worked to remove the borders for the navigation.
I also discovered the footer border entries - good with those.

Still struggling to find entries in some CSS for the other borders. For example in the attached image - TopBorderImage.tiff - the border at the top of the page - it is not associated with the navigation.

I've looked at all the css I can find in the theme - not sure where to look next. They don't seem to be defined in any php file either.

Thanks for the help.

Seth

I was looking for the code to remove this exact border too and found it--thanks to your post. I appreciate the helpful tip.

no problem :)