[Tezcatlipoca]

Adobe Photoshop (or the much cheaper & still v good Photoshop Elements) will do what you want.

You just tell it you want to make a web gallery, give it the location of the source images, & the location of the destination folder. It will make the thumbnails for you, stick them on an index page(s) & link them to the actual images. Works v well. I used Elements to make my online photo gallery.