CSS - Some Css Clarification

All I want to know is, is there a problem with Geocities and CSS or IE6 and CSS?

Hi! I need some clarification on what the right arrow meant for the UL and LI

Code:

#dmenu li>ul { 
	top: auto;
	left: auto;
}

Thanks...
FletchSOD

I was looking over the www.csszengarden.com page and the way CSS was used there, but now I'm puzzled about the way the p element & p class is used in that document.

In the stylesheet, the p element is specified but then in the html code, this type of code is used: <p class="p1"> <p class="p2"> <p class="p3">
For each new paragraph the class p is incremented by 1.
However, the classes p1, p2, p3 etc. are not specified anywhere in the stylesheet.

Is it a correct use of CSS & html code, or are the 'missing' classes perhaps an omission?
Can anybody explain to me how this affects those paragraphs?