What happens is, that you have defined your P-tag as Verdana. For some reason, you then want all files in the /garamond/ subdirectory to use Garamond instead of Verdana.
Instead of defining a class, you just import another css file using the following code:
<STYLE> @import url(basic.css); @import url(garamond.css); </STYLE>
If you use this in all files in the subdirectory, declarations in garamond.css will override settings from the "basic.css" style sheet, since it comes later in the cascade. M/p>
This concept, is also possible in RDF, where you can have multiple DTD's as your vocabulary.