Forum Moderators: not2easy
What size are you're pictures now? e.g.: 100x200, 300x500, etc...
What file-type are you saving your pictures as? e.g.: gif/jpeg/png... etc.
What graphics program are you using?
The more information you could provide ( without providing links/url's), the easier it would be to help.
You should probably get comfortable with a good graphics program and size the display image somewhere around 200 X 200 px and make it so when it's clicked, the larger version displays.
Most likely your scanner software is defaulting 90% or 100% quality which will give you very large files. 90% is not that bad but 100% will give you enormous files. Use the batch tool in Irfanview under file> Batch conversion/rename, and lower the quality to 75%. You may want to copy your originals to a new folder before doing this to insure you don't accidently overwrite them.
You can use the same tool to resize them all at once to create thumbnails which as suggested above you can use to link to the larger image.
If you have a lot of imgages thet you will be continually adding look into getting a server side image management/gallery like Coppermine Photo Gallery. This does all the work for you including generating the thumbnails.
No reason to cause your visitors to choke on large files, I find a 60% quality jpeg is sufficient quality for web display.