Sub-domains linked to different WP pages

Hi, I have a single WordPress installation on Fasthosts. What I would like to do is use different subdomains on different pages so different pages, when accessed direct, would appear to the unsuspecting user, to be a home page in their own right. For example, the true home page may be http://www.excellent-art.com, linked to that a couple more pages but not in sub directories which might be toms.excellent-art.com and janes.excellent-art.com. The attached link is a graphical representation. WP will let me change the link but only the part after the domain. Perhaps multiple WP installs? Any help would be greatly appreciated. TIA

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