gifmerge -help
=== GIFMerge Rev 1.33 (C) 1991,1992 by Mark Podlipec
Improvements by Rene K. Mueller 1996
Usage:
gifmerge [-<r>,<g>,<b>] [-<delay>] [-l<loops>] [-d<disp>] *.gif > anim.gif
-<r>,<g>,<b> set transparency, ie -192,192,192, default: no transparency
-notransp set transparency off (after you used -r,g,b before)
-<delay> set delay of between images in 1/100th secs, ie -100
default 50 (0.5secs)
-l<loops> set loop counter, ie -l0 (ever) or -l1000, default no loops
-d<disposal> set disposal 0 = no action, 1 = no dispose,
2 = restore background (default)
3 = restore previous
-pos<x>,<y> set offset position for image
-nopos reset offset position (default)
or look at http://the-labs.com/GIFMerge/