Sometimes IntelliSense gets confused by some .js files. In general, you can do nothing but remove the damaging part of the source using the trial and error.
At a minimum, in VS 2008 SP1 you can use -vsdoc.js"hack":
other.js, other-vsdoc.js .
Visual Studio IntelliSense, , IntelliSense other.js, .
, IntelliSense other.js, jQuery .