[Plugin: obsocialbookmarker] Lazy Load the JavaScript

I just updated to the latest version. Thanks for making all the changes I suggested before.

However, I found on small thing that I think will make the plugin even better. I have not turned on the Fading or the Blind Ajax options, or anything else that seems like it would require prototype or scriptaculous.

I think it would be better if these javascripts aren’t added to the wp_head section unless the options that require them are enabled.