View source for Dependent gliders

<jsxgraph width="600" height="600">
var brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-5,5,5,-5], axis:true});
var P0 = brd.create('point', [-4,-1], {name:'', face:'[]'});
var P1 = brd.create('point', [4,-1], {name:'', face:'[]'});
var li = brd.create('line', [P0,P1]);
var A = brd.create('glider', [0,-1,li]);
var B = brd.create('glider', [-3,-1,li]);
var C = brd.create('glider', [ 3,-1,li]);
brd.addHook(function() {
    if (brd.highlightedObjects['A']!=null) {
      B.position = A.position - 0.5;
      B.prepareUpdate().update(true).updateRenderer();
    }
 }, 'mousemove');
</jsxgraph>