use available constants/enums for common strings

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@9081 5f5364db-9458-4db8-a492-e30667be6df6
Missing enctype property support added to forms

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@9082 5f5364db-9458-4db8-a492-e30667be6df6
some more tests for script execution when changing the dom tree (Frank Danek)

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@9083 5f5364db-9458-4db8-a492-e30667be6df6
body.background property handling fixed for FF

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@9084 5f5364db-9458-4db8-a492-e30667be6df6
body.background property handling fixed for FF

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@9085 5f5364db-9458-4db8-a492-e30667be6df6