I don't know how to configure the chart sample

Hi,
I’m new about DHTMLX and I’m evaluating your controls before to buy a licence.

I downloaded your product but when I go to the chart sample page the chart is not rendered.
On this forum I read that I need to pass through IIS so I configured it to the port 81 (I use the port 80 for another site) but it still doesn’t work.

Where is my fault in the configuration?
Please, help me.

…another question:
How I can connect your chart to a webservice to use data from a database?

Best regards,
F.