I seriously advise against a large image on your home page.
Anybody looking at the site with a dial-up connection will get fed up waiting for it to load, decide not to bother, and go elsewhere. Better is a few thumbnails, as links to the larger images.
Maybe I'm getting a little too ambitious and over confident???!
Rubbish !! Just try it out and see, and ask for help, if it doesn't work.
And, very important, every time your site is "working", before you try out the next bit, make a copy of any pages you are going to change, so you can go back to that 'version'.
Good luck, Bob
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Searching for Coleman, Moore, Kallnung in London; Margulies, Remenyi in E. Europe; Ancestors of Hessie Stevenson-Coleman-Baxter (Ireland, 1861) and, of course, any other ancestors for my web-site http://boco.rootschat.net