Bug 190981 The image id of image in different pages are the same
The id of image generated by the same report item (such as chart) are the same, thought the image contents are in different pages.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/presentation/LocalizedContentVisitor.java
*            output type
	 * @param output
	 *            output
	 */
	protected IContent processExtendedContent( IForeignContent content, int type,
			Object output, String imageMIMEType )
	{
		assert IForeignContent.EXTERNAL_TYPE.equals( content.getRawType( ) );
		assert output != null;
		IReportContent reportContent = getReportContent( );
		
		switch ( type )
		{
			case IReportItemPresentation.OUTPUT_NONE :
				break;
			case IReportItemPresentation.OUTPUT_AS_IMAGE :
			case IReportItemPresentation.OUTPUT_AS_IMAGE_WITH_MAP :
				
				
				Object imageMap = null;
				byte[] imageContent = new byte[0];
				Object image = output;
				if ( type == IReportItemPresentation.OUTPUT_AS_IMAGE_WITH_MAP )
				{
					
					Object[] imageWithMap = (Object[]) output;
					if ( imageWithMap.length > 0 )
					{
						image = imageWithMap[0];
					}