Bug 193875 we can not get an entir url by IHTMLActionHandler
we can not get an entir url by IHTMLActionHandler, so word emitter dose not write the right url. now hyperlink drill through in word emitter doesn't work.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
if ( initProps == null || key == null )
			return null;
		return (String) initProps.get( key );
	}
	/**
	 * Returns the extension name according to format
	 * 
	 * @param format
	 * @return
	 */
	public static String getExtensionName( String format )
	{
		if ( format == null )
			return null;
		String key = "viewer.extension." + format.replaceAll( " ", "_" ); 
		return DataUtil.trimString( getInitProp( key ) );
	}
	/**
	 * Returns the output format label name
	 * 
	 * @param format
	 * @return
	 */
	public static String getOutputFormatLabel( String format )
	{
		if ( format == null )
			return null;
		String key = "viewer.label." + format.replaceAll( " ", "_" ); 
		String label = DataUtil.trimString( getInitProp( key ) );
		if ( label.length( ) <= 0 )