public int getId()
	{
		if( sp != null )
		{
			return sp.getId();    // embedded blip/pict
		}
		if( pic != null )
		{
			return pic.getId();    // embedded image
		}
		if( graphicFrame != null )
		{
			return graphicFrame.getId();    // chart
		}
		if( cxnSp != null )
		{
			return cxnSp.getId();
		}
		if( grpSp != null )
		{
			return grpSp.getId();    // embedded image
		}
		return -1;
	}