Few bug fixes and stlying

- Fixed a bug where default options where being overrided by user options on merge (meybe usefull for something in the future)
- Fixed a bug of the divMsgBoxBackGround on window resize
- Fixed a bug where jQuery.msgBox didn't work on IE7 because was being appended out of the <body> tag
- Added the same style to button focus outline in all browsers (Except IE7)