Bug 204235 Background image can not be shown when preview as PPT [1205]
engine/org.eclipse.birt.report.engine.emitter.ppt/src/org/eclipse/birt/report/engine/emitter/ppt/PPTWriter.java
println( "</span></div>" ); 
		println( "</div>" ); 
	}
	public void drawImage( byte[] imageData, String extension, float imageX,
			float imageY, float height, float width, String helpText )
			throws Exception
	{
		String imageName;
		String imageTitle = "slide" + currentPageNum + "_image"
				+ ( ++shapeCount );
		imageTitles.add( imageTitle );
		if ( imageNames.containsKey( imageTitle ) )
		{
			imageName = (String) imageNames.get( imageTitle );
		}
		else
		{
			
			imageName = imageTitle + "." + extension;
			imageNames.put( imageTitle, imageName );
			imageExtensions.put( imageTitle, extension );
			recordFileLists( imageName );
			currentImageData.put( imageTitle, imageData );
		}
		exportImageDefn( imageName, imageTitle, width, height, imageX, imageY );
	}
	/**
	 * @param imageName
	 * @param imageTitle
	 * @param width