device.shutter
			
			Standard shutter
			Parameters
			
				{{device.shutter(id, txt, item_move, item_stop, item_pos, item_shift, item_angle, item_saved, min, max, step, mode) }}
			
								id
					unique id for this widget
					txt
					name of the shutter
					item_move
					a item for the up- and down- movement
					item_stop
					a item for stopping the movement (optional)
					item_pos
					a item for the actual absolute position of the blinds
					item_shift
					a item for increase- and decreace- of the blade (optional, for future use)
					item_angle
					a item for the actual absolute angle of the blade (optional)
					item_saved
					a item for some saved positions (optional)
					min
					the minimum value for close (optional, default 0)
					max
					the maximum value for open (optional, default 255)
					step
					step between two values (optional, default 5)
					mode
					the mode: 'half' blade turns from -1 to +1, or 'full' blade turns from 0 to +1 (optional, default 'half')
			 
						
	The shutter may be used in two modes: 'half' and 'full'. The 'half' mode is for
	blade which can turn to a negativ value, normal blades do so. Some blades
	like 'S'-blades may only turn to a positv angle. For this use 'full' mode.
	
	
Example
	
		
			{{ device.shutter ('shutter1', 'Shutter 1', 'bath.blind.mov', 'bath.blind.stop', 'bath.blind.pos', 'bath.blind.adjust', 'bath.blind.angle', 'bath.blind.stored') }}
			
			{{ device.shutter ('shutter2', 'Shutter 2', 'bath.blind.mov', '', 'bath.blind.pos', 'bath.blind.adjust', 'bath.blind.angle', '', 0, 255, 5, 'full') }}
			
			{{ device.shutter ('shutter3', 'Shutter 3', 'bath.blind.mov', '', 'bath.blind.pos') }}
		
	
	
		
			Use slider to control shutter..
			
		 
		
			Shutter with all controls, 'half' mode
			
		 
		
			Shutter with less controls, 'full' mode
			
		 
		
	 
	If you want to use individual backgrounds for the shutter place them in 'pics/shutter' with size 150 x 180 as .png.
	
	Add a line to your "visu.css" with 
#PAGE-ID (current pagename, hyphen, id of the shutter-widget).
	
		#widget_device_shutter-shutter2 {
			background-image: url('../../pics/shutter/shutter_ocean.png');
			}
	
							
				inspired by Jörg Gutowski