Where do the theme files go for VS 2010. I am using VS 2010

Where do the theme files go for VS 2010. I am using VS 2010

I'm using VS 2010.  I want to use tabs with a theme.  After I download the theme using the theme roller precisely where do I install the varous parts.  I am specifically working with tabs.  However, I now have two files named \Content\jquery-ui-1.8.1.custom.css, so I put one in the Content directory and one in a subdirectory named of Content named theme.  I link both of these in the Master.cs. 

The tabs do pick up the theme, but none of the colors change when the mouse hovers over a tab.

I appreciate the help. 

Thanks

I did find that I can get color effect on the tabs using MouseEnter and MouseLeave.  I add a class in Enter and remove it in leave, but I thought that all came along with the themes and the tab.