Making a click to enlarge image button? HTML!?

I have a bunch of pictures on a webpage and I need to make it that when you click on a picture, a pop-up comes up and shows the image in a bigger size. Also, on that pop-up window, I need to display most of the other images on that webpage (thumbnail size) and when you click on them, the big image changes to... show more I have a bunch of pictures on a webpage and I need to make it that when you click on a picture, a pop-up comes up and shows the image in a bigger size.

Also, on that pop-up window, I need to display most of the other images on that webpage (thumbnail size) and when you click on them, the big image changes to that image. HELP? Thanks, looking for best answer!
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