I am trying to create a DataTable with a multi row header. I'll exemplify here:

|               2008           |           2009          |
---------------------------------------------------------
|    price      |   qty.       |    price    |   qty     |
---------------------------------------------------------
|     93993     |  34434       |     34244   |   3434    |
.....

The years headers can be fixed as I don't want to do sorting by that. Is there a way to do that in Google Visualizations?

Update

Attaching it with JS does NOT work, and it will disappear when sorting is done.

$(".google-visualization-table-table").prepend("<tr class='google-visualization-table-tr-head'><td colspan='4'>something</tr>");