IntelliJ syntax highlighting tip for Javascript

IntelliJ IDEA 10's default highlighting of an unknown variable/symbol is annoyingly non intrusive. It took a while to find, but the setting to change it is "Weak Warning" under Editor: Colors & Fonts: General. I find IntelliJ's scoping/variable finding (what do you call that?) to be excellent, so why an unknown symbol is only a Weak Warning is a little confusing, but here you have it.