smarty/docs/en/designers/language-custom-functions/language-function-popup-init.xml

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<sect1 id="language.function.popup.init">
 <title>popup_init</title>
 <para>
  popup is an integration of overLib, a library used for popup
  windows. These are used for context sensitive information, such as
  help windows or tooltips. popup_init must be called once at the
  top of any page you plan on using the <link
  linkend="language.function.popup">popup</link> function. overLib
  was written by Erik Bosrup, and the homepage is located at
  http://www.bosrup.com/web/overlib/.
 </para>
 <para>
  As of Smarty version 2.1.2, overLib does NOT come with the release.
  Download overLib, place the overlib.js file under your document
  root and supply the relative path to this file as the "src"
  parameter to popup_init.
 </para>
 <example>
  <title>popup_init</title>
  <programlisting>
<![CDATA[
{* popup_init must be called once at the top of the page *}
{popup_init src="/javascripts/overlib.js"}
]]>
  </programlisting>
 </example>
</sect1>
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