inWriter is a small JavaScript class that makes inline editing of textfields possible with a very simple coding.

How to use?
- Just execute the inwriter_init function, passing the ID off the field you want to edit and the name of the function to call after the editing has been completed.
- The called function receives two parameters:
- ID of the tag
- new value
- That’s all!
Compatibility: All Major Browsers
CSS editing is always a multi-check job because of getting different results for every browser. This time-consuming design process gets easier with CSSVista.
CSSVista is a free Windows application for web developers which lets you edit your CSS code live in both Internet Explorer and Firefox simultaneously.

With small modifications, it may be easier to work with the default html/css editor that you are using but with large updates of CSS files or creating a new one, you might want to take a look at CSSVista.
Requirements: Windows XP/Vista