Highlight curve via slider

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Depending on the value of the slider s, one of the curves is highlighted.

The underlying JavaScript code

board = JXG.JSXGraph.initBoard('jxgbox', {boundingbox: [-10, 10, 10, -10]});
var s = board.create('slider', [[1,8],[5,8],[0,0,1]]);

var g = board.create('functiongraph', [function(x){ return x*x;}],
         {
          strokeColor:function(){ return (s.Value()<0.5)?'red':'blue';},
          strokeWidth:function(){ return (s.Value()<0.5)?4:1;}
         });
var f = board.create('functiongraph', [function(x){ return x+1;}],
         {
          strokeColor:function(){ return (s.Value()>=0.5)?'red':'blue';},
          strokeWidth:function(){ return (s.Value()>=0.5)?4:1;}
         });