Set Static Height for content?

Can anyone suggest a way to set the static height for each tab? I've tried every way I know how but the arguments are ignored. As it is, switching tabs collapses the page, which temporarily distorts all other content on the page and could confuse the user. I'd like to set each tab set to have a static height, so as the user switches tabs the height remains the same while loading - which makes it much more ascetically pleasing.