Code conventions, cross-browser fixes and JSHint validation

Code conventions, cross-browser fixes and JSHint validation
; edit.js
* Creating the 'i' variable only once
* Defining winScroll before the if statements. This way when it's referenced later it will never trow an error about it being undefined.
* Moving checkSelectedText up. It was called before it's definition.
* Removed line with a loose variable on it (added in r59832)