How do i make a rotating sig?

[Red and White]

seen a few people with sigs that change on refresh, how do you do this.

stole One More Solos as example

 

[Red and White]

thanks guys

i do usually search

 

[Red and White]

ok... where can i upload all this too if i dont have webspace? is there anywhere free that anyone can recommend?

 

[Red and White]

http://www.google.co.uk/search?hl=en&q=free+php+hosting&meta=

:/

tried a few of them and they are all crap. beyond beilief crap. someone must have a reccomendation