When I check out my page in the browser, I see all the tags that I typed in. Either that or I get a blank screen or a bunch of gobbledygook at the top. If you're looking for bulletproof password protection, ask your Web hosting provider about setting up a protected file or directory. Alternatively, use a CGI script.
Some browsers are quite anal when it comes to frames.
Try moving your image files into the same directory that holds your HTML file. If you're viewing your page on the Web, perhaps you didn't send the image files to your server. Make sure you have the correct match for uppercase and lowercase letters. When I check out my page in the browser, I see all the tags that I typed in. Either that or I get a blank screen or a bunch of gobbledygook at the top.