<div id='jxgbox' class='jxgbox' style='width:500px; height:400px;'></div>
var board = JXG.JSXGraph.initBoard('jxgbox', {boundingbox: [-5, 3, 5, -3], axis:true});
var p0 = board.create('point',[-1, 1], {name:'A'});
var pl = board.create('point',[1, -1], {name:'B', fixed:true});
var p2 = board.create('point',[function(){return p0.X()}, -2], {name:'ะก'});