GUI Preferences - <guiprefs>

This <guiprefs> element allows you to set the layout and behavior of the GUI when the installer runs. This information will not have any effect on the command-line installers that will be available in future versions of IzPack.The attributes that can be specified are:

...

<langpack>
  ...
  <str id="installer.quit.reversemessage" txt="Are you sure you want to cancel installation?"/>
  <str id="installer.quit.reversetitle" txt="$APP_NAME $APP_VER"/>
  ...
</langpack>

Adding a Splash Page

The splash useSplashScreen key modifier is used to indicate that the installer should show a splash screen.
The value of the splash useSplashScreen key modifer represents the minimum amount of time (in milliseconds) to show the splash screen in milliseconds.
The image should be defined as a resource with the id of Splash.image.
The image can be any bitmap format such as a png, jpg, jpeg, gif or bmp file.
Note: Older installers using the <splash> tag will find that their splash image no longer appears. Please adapt use this new syntax.

<installation version="5.0"
              xmlns:izpack="http://izpack.org/schema/installation"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="http://izpack.org/schema/installation http://izpack.org/schema/5.0/izpack-installation-5.0.xsd">

  <info>
    <appname>Test</appname>
    <appversion>0.0</appversion>
    <appsubpath>myapp</appsubpath>
    <javaversion>1.6</javaversion>
  </info>

  <guiprefs width="800" height="600" resizable="no">
	 <!-- Show the splashScreen for a minimum of 1000 milliseconds -->	
	 <modifier key="useSplashScreen" value="1000"/>	
  </guiprefs>

  <resources>
    <!--Define the splash screen image as a reading just like a heading image -->
    <res id="Splash.image" src="images/splash.png"/>
  </resources>
</installation>

<laf> - Look and Feel

 The look and feel can be specified on a per-OS basis. For instance you can use the native look and feels feel on Win32 and OS X but use a third-party one on Unix-like platforms. To do that, you have to add some <laf> child elements to the <guiprefs> element.:

...