popup: early port
popup: only expose public method
popup: remove unused method
popup: hide protected property
remove build script
popup: start porting to jquery [1]
popup: port to jquery [2]
popup: remove now useless comment
popup: hide setCenter method
popup: remove not used property and remove setOpacity

setOpacity() change to fadeTo from jquery
popup: remove obsolete rf
popup: use ===/!== instead of ==/!=
popup: use _animDuration for fadein and fadeout duration

remove the use of intermediate variable in setFocus()
popup: remove setDialogZIndex() method
popup: remove intermediate variable
popup: don't need to bind as the object can be accessed by obj
popup: use jquery to bind click event to button
popup: update documentation
popup: footer fix
popup: remove eraseContent()