should be used in all library code. This patch replaces all uses of "$()" in
existing code. The primary reason for this is to avoid conflicts with libraries
(like Prototype) which might redefine this function differently.
git-svn-id: http://svn.openlayers.org/trunk/openlayers@2541 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
