Sum of selected cells in table

select.js

$.getScript('//code.jquery.com/ui/1.10.4/jquery-ui.js', function () {
	
	function toFixed(value, precision) {
        var power = Math.pow(10, precision || 0),
            strip = value * power;
        return Math.round(parseFloat(strip.toPrecision(12))) / power;
    }

	function format(x) {
	    x = x.toString().split('.')
	    x[0] = x[0].replace(/\B(?=(\d{3})+(?!\d))/g, " ");
	  return x.join('.');
	}
	
	var css = document.createElement("style");
	css.type = "text/css";
	css.innerHTML = ".ui-selection:after {content: attr(title); position: absolute; top: 100%; width: 100%; text-align: center; background: rgba(0,0,0,.7); color: #fff; padding: 0 3px 3px; margin-left: -3px; margin-top: 3px } .ui-selection {pointer-events: none; border: 3px rgba(0,0,0,.7) solid; position: absolute; box-sizing: border-box; } .ui-selected, .ui-selecting { background: #efefef; }";
	document.body.appendChild(css);

	var $selection = $('<div class="ui-selection"></div>');

	$('table').selectable({
		filter: 'td',
		stop: function () {
			var $cells = $(".ui-selected", this),
				count = 0;
			
			$cells
				.each(function() {
				  var number = parseFloat($(this).text().trim().replace(/\s/gi, ''));
			      count += number || 0;
			    });

		    $selection.attr('title', format(toFixed(count, 4)));
			
			var first = $cells.first().offset();
			var last = $cells.last().offset();
			$selection.css(first);
			$selection.css({
				height: last.top - first.top + $cells.last().innerHeight(),
				width: last.left - first.left + $cells.last().innerWidth()
			});

		    $('body').append($selection);
		}
	});	
});