Highlight curve via slider

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

The underlying JavaScript code

var s = board.createElement('slider', [[1,8],[5,8],[0,0,1]]);

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