Question : Anyone know a good script (or something else)

That brings images in from the left or right or even changes every couple of seconds ??

It is for a web page, i want when people open the site an image changes every couple of seconds?

Answer : Anyone know a good script (or something else)

There are plenty of solutions at DynamicDrive.com.
They will show you examples and instructions are VERY EASY to follow:

Image Slideshows: http://www.dynamicdrive.com/dynamicindex14/index.html

I love the "Swiss Army Image Slideshow" but you may want to check out the "Left-Right Image Slideshow Script". They both involve a single file to run. I don't like it when it takes 5-10 files to run a simple script.