<%= line_chart get_month_traffic, :height => "200px", :name => 'Visit',
:library => {
legend: 'none',
chartArea:{ width: '95%', left: 50, right: 0},
hAxis:{format:'MMM-d',gridlines:{color: '#CCC', count: 31}},
vAxis:{minValue:-100,viewWindowMode: 'maximized'}
} %>