Code
[img]<URL>[/img]
but
Code
[img=<URL>]
works too.
now, if you try using the second version within a spoiler tag, something weird happens:
Code
[spoiler][img=<URL>][/spoiler]
results in a working spoiler tag, that contains the image, but also the closing of the spoiler tag (and the rest of the post too):
	
 
    		            			
 
					
					
					
					
						
						
						
						
						
									cblanco ★								
									보드카 중대								
									VonManteuffel								
									Heartless Jäger