My image comes out so large, you need to use slide bar on right or bottom to view entirely. Not a very good Home Page! If I alter the image size with Photoshop software it can't be downloaded to the site for some reason.
You do not use html codes to change the size of a picture. Instead, let us find out what you are doing wrong in Photoshop. What are you saving the images as? Some filenames and file sizes could be useful.
Changing height and width will actually reduce the apparent size of the image, but not the file size. Most images that are big enough to require scrolling will effectively cripple your site as far as modem users are concerned. (When I say "most", it is because something like a 2-color .gif could be an exception)
.bmp do not look better, they take insanely long to download if people are using browsers that will display non-web formats like .bmp.
Use this online image resizer.
http://www.resize2mail.com/?option=advanced
And try uploading it somewhere else. Maybe you have used up all your disk space or something like that.