delete the YTD button form highstock plugin

application/default/views/scripts/visual/index.phtml

@@ -73,7 +73,27 @@ function drawchart(type,range,data,title) {
 			
 			'rangeSelector' :{
 				'enabled' : true,
-				'selected' : range
+				'selected' : range,
+				buttons: [{
+						type: 'month',
+						count: 1,
+						text: '1m'
+					}, {
+						type: 'month',
+						count: 3,
+						text: '3m'
+					}, {
+						type: 'month',
+						count: 6,
+						text: '6m'
+					}, {
+						type: 'year',
+						count: 1,
+						text: '1y'
+					}, {
+						type: 'all',
+						text: 'All'
+					}]
 			},
 			
 			'credits':{