selection. Use CSS ClassName in FF, and onselectstart attribute in IE, to
control selection. Fix inappropriate overriding of className in some Control
subclasses in order to let this work. Prevents accidental selection of controls
in IE and FF. r=euzuro. (Closes#1378)
git-svn-id: http://svn.openlayers.org/trunk/openlayers@6727 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
