We totally ignored the mime translation error he is getting. I don't know why that's coming up because I don't know when you are getting it.
With HTML, you can control the size the image displays without actually changing the original file, but I would just resize the pix before I add them to my photo repository. The absolute easiest tool for this I've seen than you probably have is Microsoft Office Picture Manager.
If not, do you have Microsoft Digital Image Pro, or MS Picture It, or Adobe Photoshop Elements, or Kodak EasyShare? All of these have tools to resize pix. Just make sure you give it a new name so that you don't forever change your original pic.