Unfortunately, a few months ago, the greater Seiha site started putting an inordinate load on the server it was hosted on. Apparently, the sig rotator script was to blame. I'm not entirely certain what happened, but I have known about some security holes (mostly image recursion related) in it ever since inception, not to mention that it's really designed for public use at a heavy processing expense. Since it's detrimental to the overall site, I'm going to have to take it down and discontinue its use. I apologize is this is an inconvenience for anybody, but leaving it up would destabilize the rest of the site and threaten my good standing with my host, who I rather like.
If somebody else wants to set up their own rotator using it, they have my blessing. Here's my neophyte hackjob modified version along with mcc's original installation version. By default, the script just spits out a url like " http://sig.grumpybumpers.com/sig.pl?NAME" which most forums won't accept as a valid image since it lacks the proper extension. This modified version creates the spoofed "NAME.gif" folder and inserts the randomizer script by default (which browsers will then run when it tries to call the image) instead of as a special case. Please don't ask me for help setting it up. I haven't even looked at the script for nigh on two and a half years.
mcc's rotator is still up at http://sig.grumpybumpers.com/index.cgi and looking at it, it seems that he made similar (although probably more secure) modifications and it should work for most, if not all, forums too.
Again, I apologize for any inconvenience.