Can't open http://table.finance.yahoo.com/table.csv?a=7&b=16&c=2024&d=10&e=16&f=2024&g=d&s=GM&ignore=.csv
This page is constructed entirely using PHP. The output is generated by a Java servlet at kavachart.com, but the page contents are rendered in PHP locally.
Using this construction, any server running PHP could easily point to kavachart.com or another Java server to generate chart output. You'll want to configure your own Java server to get rid of the KavaChart demo messages at the bottom of the chart.