Trying to add a widget to my theme but function not defined

  • So I’m designing a custom theme for WordPress 2.9 and managed to register the div that I’m using as a sidebar.

    When I go to install a plugin like wpng-calendar, I get a javascript error saying that some function is not defined. This happens with more than just wpng-calendar and I’m assuming that the required JS files aren’t being included in the header of the theme.

    How do I go about getting plugins and widgets to work in WordPress 2.9?

    btw, I also have jQuery included in my header already

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