I solve this.
I replace the line
var chart = new FusionCharts("/FusionCharts_Evaluation/Charts/Line.swf", "chart_up", "400", "82", "0", "0");
with this line
var chart = new FusionCharts("/FusionCharts_Evaluation/Charts/Line.swf", "chart_up", "400", "82", "0", "1");
Note that i change the last parameter from 0 to 1.
And now... this page works fine and i can change with javascript the data of the graph.