Refreshing the data in DataGrid

Hi, how can i refresh the data inside a datagrid without reloading the page. I'm using a javascript code to do the LOAD function every period of time. The data source is a XML file with random values. I generated this page using PHP code. Hope anyone can help me, and sorry for my english :S

you can use refresh() method -

grid.refresh();

http://www.activewidgets.com/aw.system.html/refresh.html