Build a Website

Hello, I need a html page/code that will have a many thumbnail images in a grid format, that when the user clicks on or hovers over the thumbnail a bigger version will appear. I also need this to be easily updatable because we need to add new swatchs and remove old swatches often. The color swatch grid will need to be broken into groups by fabric type.. So all the Cottons will be shown together, then all the Silks together, then taffeta etc.. Thanks