	var dataset_type_list = [];									// List of the dataset types
			var dataset_bar_list = [];									// List of the columns already shown in the chart, excluding the 'line' dataset
			var order = document.getElementById('select-order-column').value;	// Column selected to be ordered
			var direction = document.getElementById('select-order-direction');	// Element containing the direction of the sorting
			var quantity_data_shown = document.getElementById('select-quantity').value;	// Quantity of data to be 