.attr("transform", "translate(" + WeightsDrawer.margin.left + "," + WeightsDrawer.margin.top + ")");
var form_period = d3.select(drawer.selector).append("form")
.attr("transform", "translate(" + WeightsDrawer.margin.left + "," + WeightsDrawer.margin.top + ")");
var form_period = d3.select(drawer.selector).append("form")