Unregister Chart
With the help of this function, you can unregister a chart. It takes as parameters: the chart Id and the callback function. The chartId can be found in the response provided by the chartData function.
function unregisterChartId(chartId, callback)
Possible Responses:
Success
{
    "RQT":"unregister_chart",       // Request Type
    "RQI":"16",                     // Request Id
    "RES":"OK",                     // Result
    "ID":"27"                       // Chart Id
}
Error
{
    "RQT":"unregister_chart",       // Request Type
    "RQI":"16",                     // Request Id
    "RES":"ERR",                    // Result
    "MSG":"Chart doesn't exist"     // Error Message
}