Bug 155493 [Deploy] Pictures and chart pictures are lost when preview on Weblogic Server using WAR deploy
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
* @param paramName
	 *            String
	 * 
	 * @return String
	 */
	public static String getFormat( HttpServletRequest request, String paramName )
	{
		if ( request == null || paramName == null )
			return null;
		return getParameter( request, paramName + "_format" ); 
	}
	/**
	 * @return the isWorkingFolderAccessOnly
	 */
	public static boolean isWorkingFolderAccessOnly( )
	{
		return isDocumentFolderAccessOnly;
	}
	/**
	 * if display text of select parameter
	 * 
	 * @param paramName
	 * @return
	 */
	public static String isDisplayText( String paramName )
	{
		if ( paramName == null )
			return null;
		if ( paramName.startsWith( PREFIX_DISPLAY_TEXT ) )
		{