NS6 and CSS problems on dropdown menus.

I have CSS on my site calling for all links to be a certain color and decoration, etc. However, in NS6, when using a standard drop-down menu, those decorations appear in the drop down menu until the mouse is moved over it. Then if the menu is deselected and selected gain, it happens again. I've tried specifying no text-decoration in around the entire form feld, in the select tags, and even within the option tags. Nothing seems to help, and yet on other sites this doesn't happen, and I can't see any difference in the coding. This also happens when clicking on buttons (for submitting forms, etc.) Thanks in advance for any help anyone can offer.

-Colin