remove overlib.js file from distribution, update plugin and docs

docs/designers.sgml

@@ -3801,7 +3801,10 @@ OUTPUT:
 			http://www.bosrup.com/web/overlib/.
 			</para>
 			<para>
-			This was added to Smarty 1.4.4.
+			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>
 		</sect1>
 		<sect1 id="language.function.popup">
@@ -4201,7 +4204,7 @@ OUTPUT:
 <title>popup</title>
 <programlisting>
 {* popup_init must be called once at the top of the page *}
-{popup_init}
+{popup_init src="/javascripts/overlib.js"}
 
 {* create a link with a popup window when you move your mouse over *}
 &lt;A href="mypage.html" {popup text="This link takes you to my page!"}&gt;mypage&lt;/A&gt;