those are used in the tempalte
Code:
href="css/menu.css" type="text/css" />
href="templates/main/media/style-city.css"
href="media/dropdown_ie.css"
depending how you create your template does it deside how mutch css files you include
probaly you like to include the menu.css to get the tabs to show ( if it are the tabs , got no idea :S )
but mainly you only need to include 1 CSS that contains all variables , else the template will not look like you want to have it
if the template does not work like it need to be , then include the other css files also :D
so far i am aware , the theme_city.css is the template css , the other 2 css files are for the tabs
Greetings From PowerChaos