Tag: timer	Create a new timer that will call a function every 'interval' milliseconds.
Attrib Name	Type	Possible Values	Description
__percent-elapsed	integer	null	The percentage the timer has elapsed
__sec-last	integer	null	The second the timer was last active
__sec-started	integer	null	The second the timer started
__sec-until	integer	null	The seconds until the timer is active
__usec-last	integer	null	The microsecond the timer was last active, this is useless unless you get __sec-last too
__usec-started	integer	null	The microsecond the timer started
__usec-until	integer	null	The microseconds until the timer is active
action	(timer_node)	null	Set to the function that will be called when a timeout occurs.
interval	integer	-1,*	Sepcify the time interval before calling the action function.