only cache those values if some handlers are defined
only cache those values if some handlers are defined

avoid any useless declarations is always good :)

Smoss/Enoru-eco,rlugojr/melonJS,srbala/melonJS,MarkoIvanetic/melonJS,TukekeSoft/melonJS,rlugojr/melonJS,gopalindians/melonJS,srbala/melonJS,srbala/melonJS,TukekeSoft/melonJS,rlugojr/melonJS,MarkoIvanetic/melonJS,TukekeSoft/melonJS,gopalindians/melonJS,melonjs/melonJS,gopalindians/melonJS,Smoss/Enoru-eco,melonjs/melonJS