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I'm not a Fireworks and Dreamweaver kind of guy -- more like Photoshop and hand coding. But I'm sure your tools don't require any particular number of images, and 100 images for a single page (am I reading you correctly?) is not a sensible thing.
Any page can include any image -- you just need to include the correct path in the src attribute of the img tag. But lots of wysiwyg editors put an "images" folder on the same "level" the page is on by default.
Dreamweaver is a high end, very flexible program. But you do need to understand what it's doing and be clear about what you want it to do for best results.