Use the MediaWiki extension for JSXGraph
From JSXGraph Wiki
Download the MediaWiki extension from github.
<jsxgraph height="500" width="600" board="board" box="mybox">
board = JXG.JSXGraph.initBoard('mybox', {boundingbox: [-10, 10, 14, -10]});
var a = board.create('slider', [[1,8],[5,8],[0,1,4]]);
var b = board.create('slider', [[1,9],[5,9],[0,0.25,4]]);
var c = board.create('curve', [function(phi){return a.Value()+b.Value()*phi; }, [0, 0], 0, 8*Math.PI],
{curveType:'polar', strokewidth:4});
</jsxgraph>
