Acrobat Javascript Extension - Hello World

Great example of how to add some JavasScript functionality into Adobe Acrobat:
http://blogs.adobe.com/acdc/2010/06/acrobat_javascript_extensions.html

function helloWorld()

{
//Say Hello World
app.alert("Hello World");
}

app.addToolButton({
cName: "helloWorldBtn", // A name for your button
cExec: "helloWorld()", //Function to Call
cLabel: "Hello World", //The Text on the Button
cTooltext: "Say Hello World" //The Help Text
});

Save script as HelloWorld.js and place in:
C:\Program Files\Adobe\Acrobat 9.0\Acrobat\Javascripts

JavaScript for Acrobat
http://www.adobe.com/devnet/acrobat/javascript.html
http://www.evermap.com/javascript.asp