__doPostBack( 'EventName', 'EventArgs' );
function doPostBackAsync( eventName, eventArgs )
var prm = Sys.WebForms.PageRequestManager.getInstance();
if( !Array.contains( prm._asyncPostBackControlIDs, eventName) )
if( !Array.contains( prm._asyncPostBackControlClientIDs, eventName) )
__doPostBack( eventName, eventArgs );
You can call it just like the original __doPostBack function.