Bug 212246 Browsers keep poping up when click the series with interactivity Focus-Hyperlink [13]
chart/org.eclipse.birt.chart.device.extension/src/org/eclipse/birt/chart/device/image/JavaxImageIOWriter.java
}
		if ( bCallback )
		{
			
			return expr;
		}
		return JavascriptEvalUtil.transformToJsConstants( expr );
	}
	/**
	 * When 1). The action is supported, and the action type is INVOKE_SCRIPT.
	 * 2). The script has not been added into ImageMap. 3). The action acts on
	 * the value series area. Add the script into ImageMap.
	 * 
	 * @param sa
	 *            ShapedAction
	 * @param sb
	 *            StringBuffer
	 */
	private void userCallback( ShapedAction sa, StringBuffer sb )
	{
		addCallbackMethod( sa, sb, TriggerCondition.ONCLICK_LITERAL );
		addCallbackMethod( sa, sb, TriggerCondition.ONDBLCLICK_LITERAL );
		addCallbackMethod( sa, sb, TriggerCondition.ONMOUSEOVER_LITERAL );
		addCallbackMethod( sa, sb, TriggerCondition.ONFOCUS_LITERAL );
		addCallbackMethod( sa, sb, TriggerCondition.ONBLUR_LITERAL );
	}
	
	private void addCallbackMethod( ShapedAction sa, StringBuffer sb,
			TriggerCondition condition )
	{