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.extension/src/org/eclipse/birt/chart/device/image/JavaxImageIOWriter.java
dph = null;
					}
					String callbackFunction = getJSMethodName( condition, sa )
							+ "("; 
					callbackFunction = ScriptUtil.script( callbackFunction, dph );
					callbackFunction += ");"; 
					tag.addAttribute( htmlAttr,
							eval2JS( callbackFunction, true ) );
					return true;
			}
		}
		return false;
	}
	protected boolean processOnFocus( ShapedAction sa, HTMLTag tag )
	{
		
		return processCommonEvent( sa,
				tag,
				TriggerCondition.ONFOCUS_LITERAL,
				HTMLAttribute.ONFOCUS );
	}
	protected boolean processOnBlur( ShapedAction sa, HTMLTag tag )
	{
		
		return processCommonEvent( sa,
				tag,
				TriggerCondition.ONBLUR_LITERAL,
				HTMLAttribute.ONBLUR );
	}
	protected boolean processOnClick( ShapedAction sa, HTMLTag tag )