Bug 312531 Highlight works differently when run SvgInteractivityViewer.java [13]
chart/org.eclipse.birt.chart.device.svg/src/org/eclipse/birt/chart/device/svg/SVGInteractiveRenderer.java
if ( !( scripts.contains( script ) ) )
		{
			svg_g2d.addScript( generateCallBackMethodName( funcName )
					+ "{" + script + "}" ); 
			scripts.add( script );
		}
	}
	/**
	 * @param script
	 * @return
	 */
	private StringBuffer generateScriptCallbackFunctionName( String script )
	{
		StringBuffer callbackFunction = new StringBuffer( "callback" );
		int hashCode = script.hashCode( );
		if ( hashCode != Integer.MIN_VALUE )
		{
			callbackFunction.append( Math.abs( hashCode ) );
		}
		else
		{
			callbackFunction.append( Integer.MAX_VALUE );
		}
		return callbackFunction;
	}
	/**
	 * Set SVG attributes for URL value.
	 * 
	 * @param urlValue