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
if ( output != null )
				{
					int type = itemPresentation.getOutputType( );
					String imageMIMEType = itemPresentation.getImageMIMEType( );
					generatedContent = processExtendedContent( content, type, output, imageMIMEType );
				}
				else
				{
					generatedContent = null;
				}
				itemPresentation.finish( );
			}
			catch ( BirtException ex )
			{
				context.addException( design.getHandle( ), ex );
				logger.log( Level.SEVERE, ex.getMessage( ), ex );
			}
		}
		return generatedContent;
	}
	/**
	 * handle the content created by the IPresentation
	 * 
	 * @param item
	 *            extended item design
	 * @param emitter
	 *            emitter used to output the contnet
	 * @param content
	 *            ext content
	 * @param type