This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Replace the image being used for the close button with one of a different colour. If you want different colours in jQuery UI it's easier just to modify the theme than it is to go hacking in the CSS files.