Plugin adding to head tag after analyzing the_content

  • I’m writing a simple form to mail plugin.

    My goal is to have the possibility of adding a tag to the content, like this:

    [form 1 EN] (meaning form number 1 in English)

    This tag is captured by a filter:
    add_filter('the_content', array(&$this, 'the_content_filter'), 9);

    The function the_content_filter prints the proper form.

    My problem is that I have to add some javascripts (I’m using jQuery with some plugins) if – and only if – the_content is having a form.

    How can I pass this to the head tag in order to insert the proper code for javascripts there (without including unnecesary this scripts on every page or post)…?

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