View source for Google style chart - interactive

<jsxgraph width="647" height="400">
 var graph1;
 var brd = JXG.JSXGraph.initBoard('jxgbox', {boundingbox:[-1,6,21,-1], axis: true});

function doIt() {
   var i, x1, y1;
   var p;
   var points = [];
   var x = [];
   var y = [];
   var start = 0;
   var end = 20;
   points.push(brd.createElement('point', [start,0], {visible:false, name:'', fixed:true})); 
   for (i=start;i<=end;i++) {

     // Generate random coordinates
     x1 = i;
     y1 = Math.random()*4+1;

     // Plot it
     p = brd.createElement('point', [x1,y1], 
                   {strokeWidth:2, strokeColor:'#ffffff', 
                    highlightStrokeColor:'#0077cc', fillColor:'#0077cc',  
                    highlightFillColor:'#0077cc', style:6, name:'', fixed:true}
                 ); 
     p.highlight = function() {    
        var v = prompt("New value:",y1);
        this.setPosition(JXG.COORDS_BY_USER,this.X(),v*1.0);
     }

     points.push(p);
     x.push(x1);
     y.push(y1);
   }
   // Filled area. We need two additional points [start,0] and [end,0]
   points.push(brd.createElement('point', [end,0], {visible:false, name:'', fixed:true})); 
   brd.createElement('polygon',points, {withLines:false,fillColor:'#e6f2fa'});
   
   // Curve:
   brd.createElement('curve', [x,y], 
                 {strokeWidth:3, strokeColor:'#0077cc', 
                  highlightStrokeColor:'#0077cc'}
               ); 
}
brd.suspendUpdate();
doIt();
brd.unsuspendUpdate();
</jsxgraph>