Few changes and bug fixes

- added type to html content to use custom html content without showing any msgBox image
- added possibility to control width and height
- added return FALSE in success function to stop msgBox from closing when data validation fails
- fixed a bug of the divMsgBoxBackGround 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
- Added a demo folder with examples for fast testing