anychart.onDocumentReady(function () {
var chart = anychart.column();
var series = chart.column([
{x: 'January', value: 18},
{x: 'February', value: 25},
series.tooltip({background: {fill: '#757575', stroke: '3 #6D4C41'}});
chart.title('Set tooltip parameter as an object');
chart.container('container');