Raster.config( RASTER_HOME [, theme] )
Configure Raster home directory and theme. This method does not actually
apply any CSS or script to the documment, it only documents where are the
resources the page uses. Some library methods that dynamically generate html
will need this informaton to generate the correct url to css backgrounds,
and/or library images.
Absolute or relative URL to the /raster directory.
This is necessary for control to resolve paths to CSS and
IMAGE resource files in the application. If this value
is not set it will default to "raster" (i.e. The raster folder
is in the same directory of the *.html document).
Name of the CSS theme raster will use to render controls.
If this value is not given, the "modern" them is used.
This value is case-sensitive.