Adding events
From JSXGraph Wiki
<p id="myOutput"> </p>
var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox:[-4,4,4,-4], keepaspectratio:true});
var myPoint = brd.create('point',[1,1], {size:5});
JXG.addEvent(myPoint.rendNode, 'mouseover',
function(){ document.getElementById('myOutput').innerHTML = "Point "+this.name;},
myPoint);
JXG.addEvent(myPoint.rendNode, 'mouseout',
function(){document.getElementById('myOutput').innerHTML = ' ';},
myPoint);
myPoint.hasPoint = function(){return false; };
var myPoint2 = brd.create('point',[-1,1], {size:5});
JXG.addEvent(myPoint2.rendNode, 'mouseover',
function(){ document.getElementById('myOutput').innerHTML = "Point "+this.name;},
myPoint2);
JXG.addEvent(myPoint2.rendNode, 'mouseout',
function(){document.getElementById('myOutput').innerHTML = ' ';},
myPoint2);