Alternative to Frames splitters?

I keep reading about how bad Frames are. One featu开发者_开发技巧re I really like is how the user can drag a splitter to resize the frames. If I don't use frames, how might I go about providing the same feature?

If you insist on having a splitter you can easily find a JavaScript one, for example this jQuery Splitter Plugin.
Personally, for a regular website I believe it indicates a design problem, your design should be good as is. Very few users tweak it anyway.