Bug 214254 Expose Javascript "event" object for interactivity
When doing interactivity with a chart, and specifying a Mouse Click event with an Invoke Script action, the browser event object should be passed into the script. This object should be named "evt", and accompany the other standard category and value series parameters.
chart/org.eclipse.birt.chart.device.svg/src/org/eclipse/birt/chart/device/svg/SVGInteractiveRenderer.java
newTriggers,
							indexOnload,
							triggers.length - indexOnload - 1 );
					return newTriggers;
				}
				mapOnloadAdded.put( series, Boolean.TRUE );
			}
		}
		return triggers;
	}
	/**
	 * Process events that have been prepared and apply them to the SVG Elements
	 */
	public void addInteractivity( )
	{
		for ( Iterator iter = cacheEvents.iterator( ); iter.hasNext( ); )
		{
			CacheEvent cEvent = ( (CacheEvent) iter.next( ) );
			addEventHandling( cEvent.getElement( ),
					cEvent.getSource( ),
					cEvent.getTriggers( ) );
		}
	}
	/**
	 * Add event handling to the hotspot
	 */
	private void addEventHandling( Element elm, StructureSource src,
			Trigger[] triggers )
	{
		if ( elm != null )