Include JavaScript and CSS resources in the head.
-- attrs.components = comma separated list of ui components to include
-- attrs.effects = comma separated list of effects to include
-- attrs.theme = css theme to use, defaults to 'base'
-- attrs.mode = javascript packing to use.
Simple tag to make an element toggleable
sourceId -> link-element which fires the toggle action
targetId -> id of the element to toggle
event -> event to fire the toggle action on (OPTIONAL)
speed -> effect-speed (OPTIONAL)