Changing banners automatically

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Does anyone know how sites such as myspace has the banners change
automatically?

Is this something that would require me to creat a css file to set the
banner size so the banner that automatically pops up isn't too big for the
screen?


Also, I asked this question a while back without any exact answers.


How can I edit a section of text on a webpage remotely? Such as through my
hosting company which is password protected.



Thanks in advance!
.