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If you have Bukkit on an SMP server, get the plugin called Essentials. It has a ton of commands and one of them allows you to put your cursor on the mob spawner and type /spawner mobname. So in you case, /spawner skeleton. You need Bukkit and Essentials though.
I KNOW there is a mod that lets you place any mob spawner, but I can't remember which one it is. And I have used in my local server, so I know it works in SMP. Maybe NEI? I know that what this mod does is showing in the NEI gui a different spawner for every mob, so you can select the one you want and place it in the world. It even works with mobs from other mods. But I can't remember which mod it was... =(
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