ASP.NET - client script to pop-up window

Below is an example to use C# and client script to pop-up an explorer
{
....

string strCmd = "window.open('admin_report_mms_view.aspx?start=" + str_from + "&end=" + str_to + "&CID=" + cid + "', 'window', config='height=450,width=800,resizable=yes,toolbar=0,menubar=0,location=0')";

((ImageButton)e.Row.Cells[4].FindControl("btn_mms")).Attributes.Add("onclick", "return " + strCmd);

//((ImageButton)e.Row.Cells[4].FindControl("btn_mms")).Attributes.Add ("onclick", "return confirm('Test');"); ....

}