Made code for drop down reusable

WORKING
dropdown show by button

NOT working
added to last commit
Login latest
merging some files might be deleted
merge 2
Login and List Staff

- Bea
Login and Staffs -Bea
Javascript for drop down

NOT yet complete
drop down shows courses
Co-requisites adding
Co-requisite Drop Down

WORKING
Edit Staff and database
staff and student login latest
Editing Prereq

Don't know if it works
Merge remote-tracking branch 'origin/mele'

Conflicts:
	Web App/bea/admin/addcourse.php
	Web App/mele/_class/database.php
	Web App/seini/_class/_notes/dwsync.xml
	Web App/seini/_class/database.php
	Web App/seini/editstaff.php
Powerpoint Presentations 1 & 2
logout, delete and edit staff
Editing Prerequisite Finished

As well as validating if there is an $_GET['id']
merge