Help! Randomizer!

I need to know how to put a randomizer in a signature, this website has one in the banner, so I was thinking someone would know how.

And dont say anything about imagerotation! You have to pay for it. Even though its only 5 dollars a month but... I'm only 13, don't have a bank/cradit card, and I also just really don't want to.

Somebody said something about coding and putting a whole bunch of strings into the thread, but I don't know how... help!

*Pulls out dust from pockets*
Can't help you there.

Maybe someone else can (always think positive)

Okay,
*pulls sunshine out of ear*
Let's make it look like we're having fun at least.

Tektek.org may be your solution, Phobia; there's a signature randomizer at the bottom right of the available tools. Insaney explains the process of setting up a rotator better than I could, as I've not yet used tektek (though I fully intend to once I learn to make halfway decent signatures, xD). Hope this helps!

I currently use ImageRotate.com - One image turns to many. but that limits you to twenty images. I'm going to check out the one Selah just posted, see if it allows for more.

Ya I'll try the imagerotate one, I probably won't need more than 20, but if I do or if it doesn't work, I'll try the tektek one. Thanks for your help